1. Copy and complete this table.

2. What is the resistance of a lamp that allows 600 mA of current to flow through it when there is a potential difference of 12 V across it?

3. What is the current flowing through a piece of 10 kΩ resistance wire when there is a voltage of 15 V is across

4. What is the voltage across a 125 Ω lamp that has a current of 1.84 A flowing through it?

5. What is the purpose of a resistor in a circuit?

6. What is the difference between a fixed-value resistor and a variable resistor?

7. A variable resistor can be used to control the speed of the electric motor in a portable fan. The variable resistor has a range of values from 300 Ω to 1.5 kΩ. Assume that the motor has no resistance.

(a) What is the maximum current that can flow through the motor?

(b) What is the minimum current that can flow through the motor?

8. A variable resistor is used as a dimmer switch in a lighting circuit.

(a) What is the resistance of the variable resistor if the current flowing through the variable resistor is 0.20 A and the voltage across it is 4 V?

(b) What is the resistance of the variable resistor when the current flowing through the lamp is 5 mA and the voltage across the lamp is 2 V?