Download Unit 7: Electrical Circuits and Systems Review KEY

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CP Physics – Unit 7: Electrical Circuits and Systems Review
V = IR
1.
What is electric current? What is its symbol and unit?
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2.
Conductors transfer electricity, while insulators stop electricity flow. Wires have
conductors inside and an insulator around the outside
Draw a series circuit with a switch, 2 batteries, light bulb, and resistor. Label the
direction the current is flowing in.
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7.
A resistor is a device that converts electrical energy to another form of energy.
The symbol is R and the unit is Ohms (Ω). A fixed resistor has a set resistance; a
variable resistor can be changed.
What is the difference between conductors and insulators? How are wires made with both
conductors and insulators?
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6.
Batteries use chemical energy to provide electric potential energy (voltage).
What is a resistor? What is the symbol and unit for a resistor? What is the difference
between a fixed and variable resistor?
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5.
The light bulb won’t light without a complete circuit. A working circuit needs a
voltage source and a continuous loop of electrical energy
What kind of energy is present in batteries? What do batteries provide to a circuit?
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4.
Electric current is the flow of electric charge. The Symbol is I and the unit is A.
Why won’t a light bulb light if it touches a battery? What are two requirements for a
working circuit?
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3.
P = IV
The current is flowing clockwise.
What does voltage measure? What is the symbol and unit for voltage?
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Voltage measures electric potential energy. The symbol is V, and the unit is Volts
(V)