Physicsmedium · Past Paper
An electric bulb of 60 W is used for 5 hours a day. The energy consumed in 30 days is:
A9 kWh
B18 kWh
C90 kWh
D1.8 kWh
✓ Correct Answer: A — 9 kWh
Energy per day = 60W * 5h = 300 Wh. Energy for 30 days = 300 * 30 = 9000 Wh = 9 kWh.
Share this question
More from Physics
- Which of the following energy transformations takes place in an electric motor?
- A convex mirror always produces an image which is:
- In a longitudinal wave, the region where particles are spread apart is called what?
- Change in velocity per unit time is:
- If a sound wave travels from air into water, which property remains unchanged?