Electric current is the flow of electric charge. It is measured in Amperes and can be measured using an ammeter. The rate of electric current is equal to the total charge passed divided by the time taken. There are two types of electric current: direct current which flows in one direction and alternating current which periodically changes direction. Electromotive force is the energy converted when a coulomb of charge passes through a source and is measured in Volts. Potential difference is the energy lost when a coulomb passes between two points in a circuit and is also measured in Volts. Components connected in series have their emfs add up while those in parallel do not. Resistance depends on the material and dimensions of a conductor. It is
Ammeter is a low resistance galvanometer
It is used to measure the current in a circuit in amperes
Galvanometer can be converted into an ammeter by using a low resistance wire in parallel with the galvanometer
the resistance of the wire depends upon the range of the ammeter
As shunt resistance is small the combined resistance of the galvanometer & the shunt is very low hence the ammeter has much lower resistance than galvanometer
An ideal ammeter has zero resistance
It is the most common instrument used to measure voltage
It measure either AC or DC voltage
It is a measure of the voltage between two points of an electrical current
Electromagnetic induction builds on the concept of magnets and magnetic fields in grade 10. Most of the work covered here is quite clear and straight forward.
Ammeter is a low resistance galvanometer
It is used to measure the current in a circuit in amperes
Galvanometer can be converted into an ammeter by using a low resistance wire in parallel with the galvanometer
the resistance of the wire depends upon the range of the ammeter
As shunt resistance is small the combined resistance of the galvanometer & the shunt is very low hence the ammeter has much lower resistance than galvanometer
An ideal ammeter has zero resistance
It is the most common instrument used to measure voltage
It measure either AC or DC voltage
It is a measure of the voltage between two points of an electrical current
Electromagnetic induction builds on the concept of magnets and magnetic fields in grade 10. Most of the work covered here is quite clear and straight forward.
Physics Class X Electric Current
Contents
1 Electricity
2 Electric Current
3 Electric Potential & Potential Difference
4 Electromotive Force (emf)
5 Electric Circuit and components
6 Current and Voltage Measurements
7 OHM’s Law
8 Factors Affecting Resistance
9 Combination of Resistors(Series & Parallel)
10 Heating Effect of Electricity and its apps.
Physics Class X Electric Current
Contents
1 Electricity
2 Electric Current
3 Electric Potential & Potential Difference
4 Electromotive Force (emf)
5 Electric Circuit and components
6 Current and Voltage Measurements
7 OHM’s Law
8 Factors Affecting Resistance
9 Combination of Resistors(Series & Parallel)
10 Heating Effect of Electricity and its apps.
based on class 10 chapter electricity.
consists of topic such as-
electric potential,electric current, resistors ,series and parallel connection, heating effect of electric current, electric power,etc.
based on class 10 chapter electricity.
consists of topic such as-
electric potential,electric current, resistors ,series and parallel connection, heating effect of electric current, electric power,etc.
Current Electricity and Effects of CurrentOleepari
Electric current, potential difference and electric current. Ohm’s law; Resistance, Resistivity,
Factors on which the resistance of a conductor depends. Series combination of resistors,
parallel combination of resistors and its applications in daily life. Heating effect of electric
current and its applications in daily life. Electric power, Interrelation between P, V, I and R
This is a ppt which is based on electricity chapter of class 10 in science ncert cbse book . it will definitely enhance your knowledge and clear all concepts about this chapter .
Francesca Gottschalk - How can education support child empowerment.pptxEduSkills OECD
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Macroeconomics- Movie Location
This will be used as part of your Personal Professional Portfolio once graded.
Objective:
Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
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Dive into the world of AI! Experts Jon Hill and Tareq Monaur will guide you through AI's role in enhancing nonprofit websites and basic marketing strategies, making it easy to understand and apply.
2. Electric Current
• Electric current (I) is the rate of flow of charges.(Q)
• SI unit: Ampere (A)
• Can be measured by an ammeter (must be connected in SERIES to the circuit)
• Formula: I= Q / t
• A current of one ampere is a flow of charge at the rate of one coulomb per second.
• If the direction of the current (charge flow) is fixed, it is known as a direct current.
If the motion of the electric charges is periodically reversed; it is called an
alternating current
3. Electromotive Force
• Electromotive Force (e.m.f.) of a source is the energy converted from non-electrical to
electrical form when one coulomb of positive charge passes through the source.
• SI unit: Volt (V)
• E=W/Q, where E = e.m.f., W = work done by source, Q = amount of positive charges
• Potential difference between two points is defined as the energy converted from electrical to
other forms when a coulomb of positive charge passes between the two points.
• SI unit: Volt (V)
• V=W/Q , where V = potential difference, W = work done in driving the charge between the two points, Q = amount of positive charges
• IMPORTANT: There can be e.m.f. without a closed circuit. BUT there cannot be a potential
difference without a closed circuit.
4. Sources In Series
• When two or more sources are arranged so that the positive terminal of one
is connected to the negative terminal of the next, they are said to be in series
and their e.m.f.s add up. This arrangement gives increased e.m.f. because, the
charge flowing round a circuit will pass through more than one source and
gains electrical potential energy from each of them.
• Cells can also be arranged in parallel. In this, all the positive terminals are
connected together and all the negative terminals are connected together.
The combined e.m.f. in parallel connection will not increase like in the series
connection. But the battery will last longer before going flat.
5. Potential Difference
• When a torch bulb is connected to a battery, the torch bulb gets lit. The battery converts chemical
energy into electrical energy and is therefore a source of electrical energy. The torch bulb converts
electrical energy into heat and light and is therefore a sink of electrical energy.
• Dissipation of electrical energy between two points (e.g. across torch bulb) in an electrical circuit
causes potential difference (p.d.) between those two points
• The potential difference (p.d.) between two points in a closed circuit is defined as the energy converted
from electrical to other forms when a unit positive charge passes between the two points.
• SI unit of p.d. is the volt (V). It is the same as that of e.m.f.. (Both are measures of electrical potential
energy, e.m.f. is gained electrical energy while potential difference is lost electrical energy.)
• V=W/Q
6. Resistance
• By increasing p.d. across the ends of a conductor, current flow can be increased. But the increase
in the amount of current flow depends on the conducting ability of the conductor. Some
conductors offer some resistance to current flow than others.
• Resistance (R) of a conductor is defined as the ratio of potential difference (V), across the
conductor to the current (I), flowing through it.
• SI unit of resistance is the ohm Ω.
• V = IR
• Ohm’s law states that, the current flowing in a metallic conductor is directly proportional to the
potential difference applied across its ends, provided that all other physical conditions, such as
temperature, are constant. Comparing with V=IR, thus, R must be constant for a metallic
conductor under steady physical conditions.
7. Resistivity
• Besides temperature, experimental results shows that the resistance (R of a given conductor) also
depends on the composition and size.
• Resistance, R is found to be:
• directly proportional to its length, L
• inversely proportional to its cross-sectional area
• dependent on the type of material
• For the similar lengths and material,
Thinner wires have higher resistance than thicker wires.
• For similar thickness and material,
Longer wires have higher resistance than shorter wires.
8. Effective resistance of resistors
• In many situations, several electrical devices are connected to the same power
supply. There are two basic methods of connecting resistors or other devices
together. They are called series and parallel connections.
9. Resistors In Series
• If individual resistors are connected from end to end, the resistors are said to be
connected in series. The effective resistance, R, of three resistors of resistances R1,
R2; and R3 connected in series (shown in the figure) is given by:
• R=R1+R2+R3
• In general, if there are n resistors in series, the effective resistance R is given by:
• R=R1+R2+….+Rn
• Note: In a series connection, the effective resistance, R, is always larger than the
largest of the individual resistances.
10. Resistors In Parallel
• If each end of individual resistors are
connected together to one another as one,
the resistors are said to be connected in
parallel.
• The effective resistance, R, of three resistors
of resistances R1, R2 and R3 connected in
parallel is given by:
• 1R=1R1+1R2+1R3
• In general, if there are n resistors in parallel,
the effective resistance R is given by:
• 1R=1R1+1R2+….+1Rn
11. I/V characteristic graphs For O Level
• Metallic conductors at constant temperature
• The I-V graph of metallic conductor is a
straight line pass through the origin. They
obey Ohm’s Law, having resistance that is
independent of current. (Ohmic conductors)
• Reason: Resistance in metal is the reduction
of the drift velocity of electrons due to
collision with the lattice ions. If the
temperature of the conductor is kept
constant, the magnitude of the vibration of
the lattice ions remain the same, and hence
it’s resistance would remain the same.
12. • Filament lamp
• From the I/V graph, the ratio V/I increases as
current increases.
• Resistance of the filament lamp increase with
temperature.
• Reason: As the potential difference across a
filament lamp increases, the current increases and
the energy dissipated, as heat, increases, resulting
in a higher temperature. As the temperature
increases, resistance of the filament increases. The
collision between the free electrons and the lattice
ions increases due to more rigorous vibration of
the lattice ions.