P1.3 The usefulness of electrical appliances

Question 1

What energy transfer does a radio go through?

Answer 1

Electric to sounds and heat energy

Question 2

What does the amount of energy transferred by an appliance depend on?

Answer 2

Its power and the amount of time the appliance is switched on

Question 3

Finish the equation: Energy = Power…

Answer 3

x Time

Question 4

What is energy measured in?

Answer 4

Joules

Question 5

1 joule is the amount of energy transferred by a…

Answer 5

1 watt appliance in 1 second

Question 6

What is power measured in?

Answer 6

Watts / Kilowatts

Question 7

What are the standard units of electrical energy?

Answer 7

Kilowatt-hours (kWh)

Question 8

How might you be asked to compare the efficiency of two devices?

Answer 8

Through the use of data

Question 9

What does the amount of energy transferred depend on?

Answer 9

The time the appliance is switched on and its power

Question 10

E represents

Answer 10

Energy transferred in kilo-watt hours

Question 11

P represents

Answer 11

Power in kilowatts

Question 12

t represents

Answer 12

Time in hours