Answer to Question #178298 in Physics for Janice

Question

2. A 60-watt light bulb has a voltage of 120 volts applied across it and a current of 0.5 A flows through the bulb. What is the resistance of the light bulb?

3. A resistance of 60 ohms has 0.4 A of current flowing when it is connected across a battery. What is the voltage of the battery?

4. The resistance of a small electric motor is 24 ohms. If the motor operates properly on a voltage of 6 volts, what current does the motor require?

Answer 1

2)

$$R=\frac{V}{I}=\frac{120}{0.5}=240\Omega$$

3)

$$V=IR=(0.4)(60)=24\ V$$

4)

$$I=\frac{V}{R}=\frac{6}{24}=0.25\ A$$