Undersoil electrical heating systems are used in greenhouses. This system could also be

used under a road.

A cable just below the ground carries an electric current. One greenhouse system has a

power output of 0.50 kW.

Calculate the energy transferred in 2 minutes.

Answer:t

Explanation:

Given that,

Power output is

P = 0.50kW = 0.5 * 1000 = 500W.

We want to find energy transfer in

t = 2minutes = 2 * 60 = 120 seconds

Also, time to hour

t = 2/60 = 1/30 hour

Power is the rate of energy.

Therefore,

Power = energy / time taken

Energy = power * time taken

Energy = 0.5kW * 1/30 hr

Energy = 0.01667 kWh

Also, energy in Joule

Energy = power * time

Energy = 500W * 120s

Energy = 60,000J

Energy = 60kJ.