2. Explain the relationship between
voltage, resistance and current in an
electrical circuit—including units for
each
Compare/contrast series and parallel
circuits in terms of structure,
function, and changes in each.
Explain short circuit
Know electrical safety precautions
3. is a form of energy produced by the
movement of electrons.
refers to the presence of electric
current in wires, motors, light
bulbs, and other devices.
4. Circuit – is a closed path along which
electrical charges (electrons) flow from an
energy source.
A simple circuit is composed of:
Source - battery
Path - wire
Load - bulb
Control - switch
5. “How can the light bulb be lit for a
longer period of time?”
6.
7.
8. Voltage – (V) is the measure of pressure
under which electricity flows; in this
case it is the measure of how much
energy or force “the battery” is giving.
Volt – is the unit for voltage, named after
the Italian physicist Alessandro Volta who
invented the voltaic pile, the forerunner of
what we now call the dry cell.
9. Voltage is created by
a chemical cell (battery) when it
changes chemical energy to electrical
energy
by a generator when it changes
mechanical energy to electrical energy
by a solar cell when it changes light
energy to electrical energy.
10. Voltmeter - is a device that measures
the load or any electrical device. The
voltmeter should be connected parallel
to the load being tested.
11.
12. the movement or flow of electricity, it is
a measure of the number of electrical
charges passing through a cross-section
of a conductor in a given time.
Ampere (amp) – the unit for current, named
after Andre-Marie Ampere, a French physicist
who made important contributions to the
theory of electricity and magnetism.
14. the tendency for a material to oppose the
flow of electrons
the ability of the conductor to resist the
amount of current passing through.
Changes electrical energy into thermal
energy and light
Ex: lightbulb filament
Resistance is measured in
Ohms (Ω)
16. The total amount of electrical resistance in a
circuit determines the amount of current
that in the circuit for a given voltage.
The more resistance the circuit has, the less
current that flows.
17. Ohm’s Law – deals with the relationship
between voltage and current. This law states
that the current through a conductor is
directly proportional to the voltage.
Therefore:
An increase in voltage causes an
increase in current
18. I. Series Circuit: the current has only one loop
to flow through
things are wired one right after the other
If one thing (bulb) goes out every thing
goes out
If the circuit is broken the entire flow of
current stops
19. Current is the same at each point in
the circuit
When another resistor (light bulb) is
added in series, the total resistance
increases.
When resistance increases, current
will decrease.
Decreased current means dimmer
light.
20. II. Parallel Circuit: contains two or more
branches for current to move through
current splits up to flow through the
different branches
because all branches connect the same
two points of the circuit – the voltage
difference is the same in each branch
more current flows through the branches
that have the lower resistance
21. When one bulb is unscrewed or removed,
the other bulb is still part of a complete
circuit and remains lighted.
22. Series Circuits
1 path for current
Current is the same at
every point
Voltage drops at each
resistor
Break in circuit stops all
current
Adding resistance in
series decreases total
current (dimmer light
bulbs)
multiple paths for current
Current can be different in
each branch
Voltage same across each
resistance
Break in circuit does not
affect other bulbs
Adding resistance in
parallel increases total
current
Parallel Circuits
23. Series Connection Parallel Connection
Total Current Same as current in
individual load
Equal to the sum of
current in individual
load
Total Voltage Equal to the sum of
the voltages across
each load
Same anywhere across
two points in the circuit
Total
Resistance
Increases with
increasing load
Decreases with
increasing load
24. is a representation which uses symbols
to present the different components in a
physical electric circuit.
28. 1. Submit a hand-out with a 10-
item quiz about your topic on
Monday (Aug. 8)
2. Prepare a creative visual aid.
3. Report your topic for 10-15
minutes only including the
administration of the 10-item
quiz. An excess of 15 minutes
means demerit.
