An electric circuit is a complete, closed path through which electric charges can flow. The three essential parts of a circuit are: 1) An energy source to provide power, such as a battery 2) Conductors that allow current to flow, and 3) Electrical devices called loads that use the energy, such as light bulbs. The amount of current flowing through a circuit is affected by the voltage of the energy source and the resistance of the conductors - higher voltage and lower resistance allows more current to flow. Too much current can overheat wires and cause fires.

1. Electricity
2 Minute Drill
ELECTRICITY is…
What does electric current
flow through?
Electric Circuit

3. EQ: What is an electric circuit? (p. 317)
ANSWER:
An electric circuit is a complete, closed path
through which electric charges flow.

4. EQ: What are the 3 essential parts of a circuit?
ANSWER:
Energy Source
Definition:
Examples (3):
Load
Definition:
Examples (3):

5. EQ: How are series and parallel circuits similar
and different?
Series Parallel

6. EQ: What factors affect the amount of electric
current through a circuit?
Voltage (p. 307)
Definition:
More info:
Resistance (p. 308-309)
Definition:
More info:

7. A
D
C B
Challenge: How would the other bulbs be
affected if bulb one of the bulbs burned out?
1. If bulb A burned out…
2. If bulb B burned out…
3. If bulb C burned out…
4. If bulb D burned out…

8. EQ: What happens when there is too
much electric current moving through
a circuit? (p. 320-321)
• Too much current can cause wires to heat up, melt,
and start fires.
• Fuse – when the current gets too high, a strip of metal
melts and breaks the circuit.
• Circuit breaker – A switch that opens if the current is too
high. A strip of metal heats up and bends, opening the
circuit.

9. Circuit breaker – A switch that opens if the current is
too high. A strip of metal heats up and bends,
opening the circuit.

10. ELECTRIC MATH!
Power Triangle

11. ELECTRIC MATH!
Find the voltage of wire with a current of 6A
and a resistance of 12Ω

12. ELECTRIC MATH!
Find the resistance of TV that uses 200V and a
current of 2A.

13. ELECTRIC MATH!
Find the current of a fan that uses 120V and a
resistance of 30Ω.

14. ELECTRIC MATH!
Find the power of a Xbox that uses 120V and a
current of 6A.

15. ELECTRIC MATH!
Find the power of a light bulb with 10V and a
current of 12A

16. ELECTRIC MATH!
Find the voltage of a printer that uses 300W of
power and a current of 25A

17. – What happens to the charge of an object that
loses electrons?
– What happens to the charge of an object that
gains electrons?
– What happens to the charge of an object that
gains protons?

18. – An atom has 26 protons and 23 electrons.
What is its overall charge?
– Another atom has 47 protons and 52 electrons.
What is its overall charge?
– Will these atoms attract or repel each other?

19. – If you rub a metal rod with a piece of silk, the rod
becomes negatively charged. This means that
the silk must be…
– What is the difference between static and
current electricity?

20. Suppose you have four bulbs in a series
circuit. If you were to add five more bulbs in
series with these four, what would happen to
the brightness of the bulbs?

21. Suppose you have four bulbs in a parallel
circuit. If you were to add five more bulbs in
parallel with these four, what would happen
to the brightness of the bulbs?

22. 1. Why are loads necessary in a circuit?
2. What happens when there are too many
loads in a parallel circuit?

23. – In your own words, describe how electricity is produced at a
power plant.