Worksheet on Module 7: Electrical Machines

1.  Fill the spaces with the correct word (note that you can use the word more than one time):

Potential Energy, Electrical Energy, transformation, Light energy, chemical energy, Kinetic energy, Energy, Sound, Heat, Elastic Energy

a)  Type of energy that is stored called: ______.

b)  Energy of appliances such as stereos and computers is ______.

c)  Energy of radiant objects such as fire is ______.

d)  Form of potential energy in food ______.

e)  Type of potential energy of springs and rubber bands______

f)  In a light bulb, electrical energy changes to light energy. This is an example of an energy ____.

g)  Form of energy produced by musical instruments is ______.

h)  The ability to do work is ______.

i)  An example of Thermal energy is ______.

2.  Identify the different types of energy transformation in each of the pictures

Windmill / Flashlight
Microwave / Firecracker
Battery
Solar Calculator / Person Eating
TV / Mixer
Light / Iron
Candle / Nuclear Power Plan
Piano / Hot-air Balloon

3.  Give an example where the following energy changes would take place:

a)  Electrical to Thermal

b)  Chemical to Thermal

c)  Electrical to Mechanical

4.  Fill the spaces with the correct word (note that you can use the word more than one time):

Electrons, Electrical, kinetic, insulator, mechanical, dynamo, generator

a)  The motor will convert ______energy to ______energy.

b)  Electrical machine is a device that converts either ______energy to ______energy or vice versa.

c)  Motors and generators are examples of ______machines.

d)  When a motor is used to generate electricity, it is called a ______or ______

e)  Electrical energy is delivered by tiny charged particles called ______

f)  A capacitor is a device used to store ______energy

g)  A capacitor is made from two metal plates with a thin layer of ______between them.

h)  When a lamp is connected to a generator the load ______(increase / decrease) and in this case the applied force should ______(increase / decrease).

i)  When more loads are connected to a generator, the torque needed by the generator will be ______(more/less).

5.  Draw the energy transfer diagram of Lamp

6.  Draw the simple energy transfer diagram of the following:

·  Car Engine:

·  Plant

·  Electric Guitar

Good Luck: Eng. Rose Hasan J