Physicshard · Past Paper
How many 60W bulbs can be safely used on a 220V circuit with a 5A fuse?
A10 bulbs
B18 bulbs
C25 bulbs
D5 bulbs
✓ Correct Answer: B — 18 bulbs
Total max power = V * I = 220 * 5 = 1100W. Number of bulbs = 1100 / 60 ≈ 18.33. Max is 18.
Share this question
More from Physics
- A body of mass 100g is moving with a velocity of 5m/s. Its momentum is:
- The power of a lens is -2.0 D. What is its focal length?
- Why are the foundations of high-rise buildings made wide?
- What happens to the focal length of a convex lens when it is immersed in water?
- If a machine does 500 J of work in 10 seconds, its power is: