Energy and Electricity

Question 1

What is the unit of measurement for current

Answer 1

Amperes or Amps (A)

Question 2

What is the unit of measurement for voltage

Answer 2

Volts (V)

Question 3

What is the unit of measurement for resistance

Answer 3

Ohms or (Ω)

Question 4

What is a parallel circuit

Answer 4

A circuit where the current has multiple choice for routes

Question 5

What is a series circuit

Answer 5

A circuit where the current has only one choice for route

Question 6

In a parallel circuit, what happens to the rest of the bulbs when 1 bulb ‘blows.’ State why

Answer 6

The other bulbs remain unaffected because the circuit stays closed since the current has multiple routes as long as the source of energy remains on.

Question 7

In a series circuit, what happens to the rest of the bulbs when 1 bulb ‘blows.’ State why

Answer 7

The other bulbs turn off because the current could only travel around the circuit one way.

Question 8

What is an energy transfer

Answer 8

Energy that has moved from one place to another

Question 9

What in an energy transformation

Answer 9

Energy that hase changed from one form to another

Question 10

Energy input =

Answer 10

Energy output

Question 11

What is the unit of measurement for energy

Answer 11

jules (j)

Question 12

What is wasted energy

Answer 12

Wasted energy is spread out into its surroundings

Question 13

What are the two main forms of energy? Give a definition of both.

Answer 13

Kinetic - energy in movement and Potential - stored enrgy

Question 14

What is energy

Answer 14

The ability to do work

Question 15

What is energy efficiency?

Answer 15

Energy effieciency is how much useful energy is used in the product

Question 16

What is the law of conservation of energy?

Answer 16

Energy can neither be created nor destroyed, it can only be transferred from one place to another or transformed from one form to another.

Question 17

What is the function of a wire in a circuit?

Answer 17

To pass current easily from one part of the circuit to another

Question 18

What is the function of a cell in a circuit?

Answer 18

The cell supplies electrical energy.

Question 19

What is the difference between a cell and a battery?

Answer 19

A cell is singular, but a battery is strictly two or more cells.

Question 20

What is a lamp in a circuit

Answer 20

A lamp converts electrical energy to light.

Question 21

What is an on/off switch in a circuit

Answer 21

An n/off switch allows current to flow only when it is in the closed (on) position.

Question 22

What is a resistor in a circuit.

Answer 22

The resistor restricts the flow of current through a circuit

Question 23

What is a variable resistor in a circuit

Answer 23

A variable resistor is usually used to control the current. e.g: adjusting the brightness of a lamp.

Question 24

What is current

Answer 24

The rate at which the electrons are moving

Question 25

What is voltage

Answer 25

The amount of energy ‘pushed’ out from the battery

Question 26

What is resistance

Answer 26

What opposes the flow of electrons in a circuit

Question 27

What happens to the current when the voltage decreases? Name what type of relationship this is.

Answer 27

The current decreases. This is a direct proportional relationship

Question 28

What happens to the current when the resistance increases? Name the type of relationship.

Answer 28

The current will decrease. This is a inversely proportional relationship

Question 29

What is Ohm’s Law?

Answer 29

Voltage is equal to the current multiplied by the resistance. (V =IR)