Calculating Energy Transferred by Appliances

Question 1

A kettle has a power rating of 2200W and is used for 80 seconds. Calculate the total energy transferred

Answer 1

total energy = 176 000J or 176kJ
total energy(J) = 2200W x 80s

use P.E.T
E= P x T

Question 2

what equation is used to calculate energy?

Answer 2

PET= triangle

E=P x T

Question 3

a fan has a power rating of 20W and is used for 1 hour. Calculate the total energy transferred.

Answer 3

energy transfer= 72 000J or 72kJ

P.E.T
energy transfer(J)= 20W x 1 hour
energy transfer(J)= 20W x 3600

Question 4

an iron is used for 5 minutes and a total of 600 000J of energy is transferred
calculate the power of the iron

Answer 4

Power= 2000J or 2kJ

P.E.T
Power(W)= Energy/Time
Power(W)= 600 000J/300

Question 5

The blender has a power of 400 WATTS and a total of 48,000 J of energy is transferred when the blender is in use. Calculate the time that the blender is used for

Answer 5

Time(s)=120Watts

P.E.T
Time(s)= energy/power
Time(s)=48000/400