EASY
Upper Secondary: IGCSE
IMPORTANT
Earn 100

How many watts are there in a megawatt?

Important Questions on Work and Power

EASY
Upper Secondary: IGCSE
IMPORTANT
It is estimated that the human brain has a power requirement of 40 W. How many joules per second is that?
EASY
Upper Secondary: IGCSE
IMPORTANT
A light bulb transfers 1000 J of energy in 10 s. What is its power?
EASY
Upper Secondary: IGCSE
IMPORTANT
An electric motor transfers 100 J in 8.0 s. If it then transfers the same amount of energy in 6.0 s, has its power increased or decreased?
EASY
Upper Secondary: IGCSE
IMPORTANT
Write an equation showing how work done and energy transferred are related.
EASY
Upper Secondary: IGCSE
IMPORTANT

We can calculate work done using this equation: W=F×d.

Write this equation in words.

EASY
Upper Secondary: IGCSE
IMPORTANT

We can calculate work done using this equation: W=F×d.

Copy and complete the table to show the units of each quantity in the equation.

Quantity Unit
W  
F  
d  
EASY
Upper Secondary: IGCSE
IMPORTANT

We can calculate work done using this equation: W=F×d.

We can also write W=E. What does E represent?

EASY
Upper Secondary: IGCSE
IMPORTANT

We can calculate power using this equation: P=Wt.

Write this equation in words.