A hair dryer uses 2000J in 5 seconds when on full power. The power used is?
we are told that E = 2000J and t = 5s we need to find P
recall which formula used energy, time and power
P = E/t
sub in values
P = 2000/5
= 400 W (DONT FORGET UNITS)
TF
Related Physics GCSE answers
All answers ▸Why is the nuclear model better than the plum pudding model of the atom?
Can you explain the different ways heat can travel?
The critical angle for a glass is 41 degrees. Calculate its refractive index.
A car is travelling at 10m/s. It then accelerates at a constant rate.Find the time taken for the car to travel 1km if the car’s final velocity is then 22m/s .