Electricity Basics

Question 1

Define a cell

Answer 1

A cell is a device that changes potential energy into kinetic energy

Question 2

What is an electrolyte?

Answer 2

An electrolyte is a liquid which conducts electrical current

Question 3

What is voltage?

Answer 3

It is the amount of potential energy provided by a cell

Question 4

How is a volt meter connected to a circuit?

Answer 4

In parallel

Question 5

What is a battery?

Answer 5

Two or more cells that are connected

Question 6

What are the materials needed to make a zinc-copper cell?

Answer 6

• Zinc electrode
• Copper electrode
• Connecting wire
• Electrolyte with Zn2+ ions
• Electrolyte with Cu2+ ions
• Salt bridge

Question 7

What is resistance?

Answer 7

The ability to oppose the flow of charge

Question 8

What is current?

Answer 8

The movement of charge

Question 9

What is a parallel circuit?

Answer 9

A circuit with more than one pathway for the current to flow

Question 10

What is a series circuit?

Answer 10

A circuit with only one pathway for the current to flow

Question 11

What is the unit used for current?

Answer 11

Ampere (A)

Question 12

What is the symbol used for current in equations?

Answer 12

I

Question 13

What is potential difference?

Answer 13

The amount of energy per charge

Question 14

What is the unit for Volts/potential difference?

Answer 14

V

Question 15

What is the equation of voltage?

Answer 15

Volts = Joules per coulomb of charge

Question 16

What is the unit for resistance?

Answer 16

ohm (Ω)

Question 17

What is the symbol used for resistance in equations?

Answer 17

R

Question 18

What is power?

Answer 18

The rate at which electrical work is done

Question 19

What is the unit for power?

Answer 19

Watt (W)

Question 20

What is the equation for a watt?

Answer 20

Watt = Joules/second

Question 21

How do you figure out resistance?

Answer 21

Voltage divided by Current

Question 22

How do you figure out current?

Answer 22

Voltage divided by resistance

Question 23

How do you figure out voltage?

Answer 23

Current times resistance

Question 24

What is a stepped tariff?

Answer 24

When the amount charged increases the more units you use

E.G: 0-500 units is R1 per unit and 501-1000 units is R2 per unit

Question 25

If you bought 1050 units how would it cost if:
0 - 500 = R1/unit
501 - 1000 = R2/unit
1001 - 2000 = R4/unit

Answer 25

500 x 1 @ R1 + 500 x 2 @ R2 + 50 x 4 @ R4 = R1700