Page 299 - General Knowledge

GENERAL KNOWLEDGE 2019

Electromagnetic Energy
 Power lines carry electromagnetic energy into your home in the form of electricity.
 Light is a form of electromagnetic energy.
 Each color of light represents a different amount of electromagnetic energy.

 Electromagnetic energy is also carried by X-rays, radio waves, and laser light.
Nuclear Energy
 The nucleus of an atom is the source of nuclear energy.
 When the nucleus splits nuclear energy is released in the form of heat energy and light
energy.
 Nuclear energy is also released when nuclei collide at high speeds and join.
 It is the most concentrated form of energy.

Electrical Energy
 Electrical energy can be used to move charged particles through a wire from a power plant
to our homes and businesses.
 The movement of a charged particle through a wire is called current, or more
commonly, electricity.
 Electricity is used to work various appliances in our homes.

Energy Conversion
 Energy can be changed from one form to another.
 Changes in the form of energy are called energy conversions.
 All forms of energy can be converted into other forms.
 In an electric motor, electromagnetic energy is converted to mechanical energy.
 In a battery, chemical energy is converted into electromagnetic energy.

 The mechanical energy of a waterfall is converted to electrical energy in a generator.
 In an automobile engine, fuel is burned to convert chemical energy into heat energy.
 The heat energy is then changed into mechanical energy.

Power
 Power is the rate of doing work.
 It is the amount of energy consumed per unit time.
 Having no direction, it is a scalar quantity.
 In SI system, the unit of power is the joule per second (J/s), known as the watt in honor of
James Watt, the eighteenth century developer of the steam engine.
 Work can be done slowly or quickly, but the time taken to perform the work doesn‘t affect the
amount of work which is done, since there is no element of time in the definition for work.
 However, if you do the work quickly, you are operating at a higher power level than if you do
the work slowly.
 Power is defined as the rate at which work is done. Oftentimes we think of electricity when
we think of power, but it can be applied to mechanical work and energy as easily as it is
applied to electrical energy.
 The equation for power is

 It has units of joules/second or watts (W).

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