Electric Current
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The document discusses electric current and related concepts. It defines current as the flow of electric charge from one place to another, measured in amperes. Current can be direct or alternating. Resistance is a property that weakens current flow and is measured in ohms. Ohm's law states current is directly proportional to voltage and inversely proportional to resistance. Circuits can have one or more loops and resistors can be connected in series or parallel. Power is the rate at which electrical energy is transferred by a current.
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This document defines basic electrical concepts and components. It aims to explain electricity, current, voltage, resistance, Ohm's law, and the differences between alternating current (AC) and direct current (DC). Key points covered include the basic particles that make up electric charge, the three classifications of materials as conductors, insulators or semiconductors, circuit diagrams, and formulas for power, current, voltage and resistance.
4.3 form 4 current
The document discusses electric current, resistance, electromotive force, and some basic circuit concepts:
1) Electric current is defined as the flow of electric charge through a cross-sectional area per unit time. It is measured in amperes.
2) Resistance depends on the length, cross-sectional area, temperature, and material of a conductor. It is measured in ohms.
3) An electromotive force is a device that provides electric potential difference (voltage) to push current through a circuit against resistance. Batteries and generators are common sources of electromotive force.
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This document discusses key concepts in medical physics related to electric current and circuits. It begins by defining electric current as the flow of charge and discusses its units. It then explains how potential difference and a conduction pathway are needed to produce current. Electromotive force is introduced as the maximum potential difference provided by a battery due to chemical reactions. Ohm's law relates current, voltage, and resistance. Resistors in series and parallel are examined. Alternating current is also covered.
Current electricity Series Parallel.ppt
This document discusses key concepts related to electricity including current, potential, electromotive force, internal resistance of cells, resistance of conductors, Ohm's law, resistivity, conductivity, and combinations of resistors. It defines current as the rate of flow of charge and describes how current, potential, resistance, and resistivity are calculated. It also explains how resistance and resistivity change with temperature and the formulas for calculating equivalent resistance when resistors are combined in series or parallel.
Electric field ohm s law_ etc.ppt
This document discusses several key concepts in electricity including:
1. Electric current is defined as the rate of flow of electric charge through a surface. The SI unit for current is the ampere.
2. Ohm's law states that the current through a conductor is directly proportional to the voltage applied. It is defined by the equation I = V/R where I is current, V is voltage, and R is resistance.
3. Resistance depends on the material properties, length, and cross-sectional area of the conductor. It can also vary with temperature according to its temperature coefficient.
ELECTRICITY.ppt.pptx
This document provides a summary of key concepts in electricity including:
1. Electric current is the flow of electrons through a conductor measured in amperes. Current flows from the positive terminal to the negative terminal of a battery.
2. Potential difference is the difference in electric potential provided by a battery that causes electric current. It is measured in volts.
3. An electric circuit is a continuous loop through which electric current can flow, including components like batteries, wires, switches, and resistors.
ELECTRICITY.ppt.pptx
This document provides a summary of key concepts in electricity including:
1. Electric current is the flow of electrons through a conductor measured in amperes. Current flows from the positive terminal to the negative terminal of a battery.
2. Potential difference is the difference in electric potential provided by a battery that causes electric current. It is measured in volts.
3. An electric circuit is a continuous loop through which electric current can flow, including components like batteries, wires, switches, and resistors.
Electicity notes by r k chaudhari sir
Electricity involves the flow of electric charge through conductors. Some key concepts covered in the document include:
1. Electric current is the flow of electric charge through a conductor. It is measured in amperes.
2. An electric circuit is a closed loop through which electric current can flow. Resistance opposes the flow of current.
3. Ohm's law states that the current through a conductor is directly proportional to the voltage applied and inversely proportional to the resistance of the conductor. Power is equal to voltage times current.
4. Resistors dissipate electrical energy as heat due to resistance. The amount of heat generated depends on factors like current, resistance, and time based on
Electricity class x
1. Electric current is the flow of electric charge, usually carried by moving electrons through a conductor. The direction of conventional current is opposite to the direction of electron flow.
2. An electric circuit is a closed path formed by conductors through which electric current can flow.
3. Resistance is a property of conductors that opposes the flow of electric current. The resistance of a conductor depends on its material, length, and cross-sectional area.
Chapter1: Electricity
1. The document discusses electricity, including electric charge, current, potential difference, and circuits. It defines key terms and concepts and provides examples of calculations.
2. Series and parallel circuits are analyzed and compared. Equations for current, voltage, and resistance in each type of circuit are provided.
3. The relationship between potential difference and current is explored through Ohm's Law. Factors that affect resistance are also described.
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Electric Current
- 1. ELECTRIC CURRENT A flow of charge from one place to another. The unit is Ampere , which equal to a flow of 1 coulomb per second.
- 7. continuation: - - - - - - t = t 0 t = t 0 + 1 s plane plane
- 11. continuation: I 0 I 1 I 2 I 0 = I 1 + I 2
- 32. Current Potential Difference graph of a 1000 W resistor , an Ohmic device. -4 -2 0 +2 +4 -2 +2 0 Current (mA) Potential Difference (V)
- 33. Current vs Potential Difference graph of a pn junction diode , a non-ohmic device. -4 -2 0 +2 +4 -2 +2 0 Current (mA) Potential Difference (V)
- 41. Resistors in Single Loop Circuit
- 43. Equivalent resistance in a Series Circuit
- 46. Equivalent resistance in a Parallel Circuit
- 49. POWER IN CIRCUITS
- 56. What happen when one component in a series circuit was cut-off?
- 57. What happen when one component in a multiloop circuit was cut-off?
- 63. RC CIRCUIT (Resistor and Capacitor in a circuit)
- 65. Charging a capacitor R + - C S 1 S 2 ε + - I I I I I closed open Where: V R = Potential difference across the resistor. V C = Potential difference across the capacitor. I