physcis lesson 5

Question 1

power

Answer 1

(P) is the rate of doing work or using energy, measured in watts

Question 2

Energy (E) is how much electricity is used over time.

Answer 2

(E) is how much electricity is used over time., measured in joules or kWh

Question 3

1 kWh

Answer 3

3.6 × 10⁶ J

Question 4

Transformers

Answer 4

change (step up or step down) the voltage of electricity., only work wit AC

Question 5

Step-up transformer:

Answer 5

Increases voltage (for long-distance transmission).

Question 6

Step-down transformer:

Answer 6

Decreases voltage (for safe home use).