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# Electricity and Circuits (Grade 9)

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## Electricity and Circuits

Instructions: Read each question carefully. Choose the answer that best fits the question. Short answer response questions must be responded to in complete sentences. If the question involves calculations, you must show all your math work.

1.
The amount of energy per Coulomb of charge in a circuit is determined by what property?
1. Current
2. Resistance
3. Voltage
4. Power
2.
Complete the following statement:

If you increase the resistance in a series circuit,                               .
1. the current will also increase
2. the current will decrease
3. the voltage will increase
4. the voltage will decrease
3.
A light bulb with resistance of 2 ohms is connected to a 4-V battery. What is the current flowing through the circuit?
1. 0.5 A
2. 5 A
3. 2 A
4. 1 A
4.
Which of the following always remains constant on a series circuit?
1. current
2. voltage
3. resistance
4. power
5.
When you are at home, turning off a light usually does not turn off your T.V. This is because
1. most electrical devices in a house are on parallel circuits.
2. most electrical devices in a house are on series circuits.
3. they have different sources of voltage.
4. a T.V. does not require electricity.
6.
This is the symbol for a battery.
1. True
2. False
7.
Jayton builds a project in which light bulb A and light bulb B are in parallel circuits. The project has a switch and uses a battery for its source of voltage. She connects her battery and neither light turns on. Which of the following could possibly be the problem with her project?
1. Light bulb A is broken.
2. Light bulb B is broken
3. The switch is not closed
4. Any of these would cause the problem described
8.
Explain the Law of Conservation of Charge.

9.
The method for adding fuel cells to increase electrical voltage is called
1. smacking.
2. stocking.
3. stacking.