Science 8 Flashcards

What is energy?

The ability to do work or cause change.

What is the law of conservation of energy?

Energy cannot be created or destroyed, only converted into different forms.

What is energy efficiency?

The ratio of useful energy output to total energy input, expressed as a percentage.

What are the six forms of energy?

Chemical, Mechanical, Electrical, Radiant Thermal, Nuclear.

Give an example of chemical energy.

Food, fuel, batteries

How is electrical energy converted into radiant energy?

Through devices such as light bulbs.

What does BTU stand for, and what does it measure?

British Thermal Unit; measures heat energy.

What is the formula for electrical power?

Power (W) = Voltage (V) x Current (A).

How many watts are in a kilowatt?

1,000 watts.

What are the steps of electricity distribution?

Generation → Transmission → Distribution → Usage

What is peak demand?

The highest period of demanded electricity in a power system.

What is base-load power?

The minimum level of demand that must be met continuosly.

Who discovered electromagnetic induction?

Micheal Faray

WHo proved that lightning is electricity?

Benjamin Franklin

Who invented the electric battery?

Alessandro Volta.

Who developed practical electric lighting?

Thomas Edison

Who promoted AC power distribution?

George Westinghouse.

What is the relationship between watts, volts, and amps?

W = V x A

How do you calculate KWH’s?

kWh = (Watts / 1,000) x Hours