Electricity

Question 1

What is electric current

Answer 1

The rate at which electric charge flows

Question 2

What is the flow of electrons in a circuit

Answer 2

Negative terminal to Positive terminal

Question 3

What is the definition of Potential difference

Answer 3

a measure of energy, per unit of charge transferred between two points in a component.

Question 4

SI unit of current and the device to measure it

Answer 4

Ampere: (A) and Ammeter

Question 5

Arrangement of an Ammeter

Answer 5

Series. Positive terminal to Positive terminal of the cell and Negative terminal to Negative terminal of the cell.

Question 6

What does a Ammeter measure

Answer 6

Current flowing through the circuit

Question 7

SI unit of Potential Difference and the device to measure it

Answer 7

Voltage: V and a Voltmeter

Question 8

How to connect a voltmeter

Answer 8

Connect in parallel to the component. Negative terminal to the Negative terminal of the cell and Positive terminal to the Positive terminal of the cell.

Question 9

What is the definition of electrical resistance

Answer 9

measure of how much of a component opposes the flow of electrical current

Question 10

When the slider is to the left what happens

Answer 10

The rheostat has minimum resistance. The current then increases.

Question 11

When the slider is to the right what happens

Answer 11

The rheostat has more resistance. The current in the circuit then decreases.

Question 12

Why is it better to arrange fixed resistors in parallel

Answer 12

This way there is more than one path for current to flow. This reduces the overall resistance in the circuit. Increasing current output.

Question 13

What are the types positive effects of electricity

Answer 13

Chemical, Heating, Magnetic

Question 14

What is electroplating

Answer 14

When electric current passes through chemical solutions and liquids

Question 15

What is Electroplating used for

Answer 15

Used for extracting metals or coating a thin layer of metals.

Question 16

What is the heating effect?

Answer 16

When electric current passes through a heating element and some electrical energy is converted to heat energy

Question 17

What is the magnetic effects of electricity

Answer 17

Electric current flows through a magnetic material it will gain magnetism and become an electromagnet. It can also deflect compasses

Question 18

Two Hazards of electricty

Answer 18

Electric fires and Electric shocks.

Question 19

Why do insulators not conduct electrity?

Answer 19

The electrons cannot flow freely.

Question 20

Electic fire causes

Answer 20

Overloading, excess current flow, melting of wires and damage to the circuit

Question 21

How do Electric shocks occur

Answer 21

1. Insulating materials of a wire is worn out
2. Exposure of live wires
3. Water exposure
4. Inserting our fingers or objects that can conduct electricity into sockets.

Question 22

Safety devices

Answer 22

fuse and circuit breaker

Question 23

Fuse function

Answer 23

A component with a low resistance wire. When the fuse blows it causes and open circuit when the circuit has too much current flowing through it.

Question 24

Circuit breaker function

Answer 24

It has many switches connected to each household appliance. When the current flow is too large or the circuit is faulty, the switch linked to it trips and cuts off the current.

Question 25

What is power

Answer 25

Electrical energy converted per unit of time.

Question 26

Watt to KiloWatt formula

Answer 26

(Watts x time in hours) divided by 1000

Question 27

Si unit of power

Answer 27

Watt: (W)