Question

How much energy does a pair of 800w hair straighteners transfer every second?

Answer 1

Answer: 800 J

Explanation:

Power is the rate between the energy transferred (E) and the time taken (t):

$P=\frac{E}{t}$

In this problem, the hair straightener has a power of P = 800 W. therefore, the energy transferred in t = 1 second is

$E=Pt=(800 W)(1 s)=800 J$

Answer 2

Power is a measure of the rate of energy or work done on a system. It has units of energy per time. In SI, Joules per second and is equal to the units of Watts. So, for an 800 Watts hair straightener, the energy transfer per second would be 800 Joules.