Question

key concept: interconversion of the forms of energy
activity 4
rohan and sonlya are very curious to learn about the different forms of energy
utilized and the different forms of energy produced by machines. they have
prepared a list of machines given below.
help them to clear their understanding of the concept by writing the correct forms
of energy in the boxes as applicable. one is done for you.
form of input energy
form of output energy
electrical energy
mechanical energy
a ceiling fan
a fire alarm
a toaster
a torch light
a solar heater

Explanation:

Step1: Fire alarm

Electrical energy is input (as it needs electricity to work). Sound energy is output (it makes a loud sound).

Step2: Toaster

Electrical energy is input (plugged into power). Heat energy is output (toasts bread by heating).

Step3: Torch light

Chemical energy (from battery) is input. Light energy is output.

Step4: Solar heater

Light (solar) energy is input. Heat energy is output (heats water etc).

Answer:

Fire alarm: Input - electrical energy, Output - sound energy
Toaster: Input - electrical energy, Output - heat energy
Torch light: Input - chemical energy, Output - light energy
Solar heater: Input - light (solar) energy, Output - heat energy