E = p x t

Check the correct formulas below!

• t = E x P

• t = E/P

• E = P x t

• P = E/t

• P = E x t

the unit of electrical energy is

• second (s)

• Watt (W)

• Joule (J)

the unit of electrical power is

• second (s)

• Watt (W)

• Joule (J)

the unit of time is

• second (s)

• Watt (W)

• Joule (J)

A 240 Watt(W) of blender is used for 2 minutes (120 seconds) . How much electrical energy is used ?

• 2 J

• 480 J

• 28,800 J

An electrical iron has used 45000 J of energy for 15 seconds. How much electrical energy does the electrical iron have?

• 3000 W

• 675,000 W

• 30000 W

• 6750 W

How much time does a person use 15000 J of energy in a 750 W hairdryer?

• 100 s

• 200 s

• 300 s

• 400 s