power

Question 1

What is the definition of power in physics?

Answer 1

Power = Rate of doing work

Question 2

What is the formula for power?

Answer 2

𝑃

A:

𝑊/t where W = work done and t = time taken.

Question 3

What is the SI unit of power and whom is it named after?

Answer 3

Watt (W), named after James Watt.

Question 4

What is the relation of watt to joules and seconds?

Answer 4

1 watt = 1 joule/second

Question 5

What is horse power (H.P.) in terms of watts?

Answer 5

1 H.P. = 746 watts

Question 6

How many joules are in 1 watt-second, 1 watt-hour, and 1 kilowatt-hour?

Answer 6

1 watt-second = 1 joule

1 watt-hour = 3600 joules

1 kilowatt-hour = 3.6 × 10⁶ joules

Question 7

Which are units of power and which are units of work/energy?

Answer 7

Units of power: W, kW, MW, H.P.

Units of work/energy: Ws, Wh, kWh