3. The current in a flashlight powered by 4.5 Volts is 0.5 A. What is the power delivered to the flashlight?

4. If the flashlight in the previous problem is left on for 3 minutes, how much electric energy is delivered to the bulb?

Question 3: 2.25 watts

Question 4: 405 joules

Explanation:

question 3:

Current = 0.5 amps

Voltage = 4.5 volts

Power = current x voltage

Power=0.5 x 4.5

power=2.25 watts

Question 4

Current = 0.5 amps

Voltage = 4.5v

Time=3 minutes

Time = 3x60

Time = 180 seconds

Energy=current x voltage x time

Energy = 0.5 x 4.5 x 180

Energy = 405 joules