Electricity

Question 1

The main components of an electrical system consist of?

Answer 1

-an energy source
-an electric charge
-a switch
-connecting wires
-electrical device

Question 2

What is the SI unit for charge?

Answer 2

coulomb (C)

Question 3

What is the SI for electric current?

Answer 3

ampere (A)

Question 4

What device is used to measure electric current in a circuit?

Answer 4

An Ammeter

Question 5

How is an ammeter supposed to be connected to an electric circuit?

Answer 5

In series

Question 6

What is potential difference?

Answer 6

The amount of energy needed to move a unit charge from one point in an electric circuit to another point

Question 7

What is the SI unit for potential difference?

Answer 7

Volt (V)

Question 8

How is a voltmeter supposed to be connected to an electric circuit?

Answer 8

in parallel

Question 9

What device is used to measure the potential difference in an electrical circuit?

Answer 9

A voltmeter

Question 10

What is electrical resistance?

Answer 10

It is a measure of how much the component opposes the flow of electric current

Question 11

What is the SI unit of electrical resistance?

Answer 11

R

Question 12

What device is used to increase the electrical resistance in a circuit?

Answer 12

A resistor

Question 13

How do you calculate resistance in a circuit?

Answer 13

Total resistance = potential difference divided by the current

Question 14

What are the useful effects of electricity?

Answer 14

-Chemical effect
-heating effect
-magnetic effect

Question 15

What are the harmful effects of electricity?

Answer 15

-electrical fire
-electric shock

Question 16

What is power?

Answer 16

The amount of electrical energy used for conversion to other forms of energy per unit of time is referred to as the power of an electrical appliance

Question 17

What is the SI of power?

Answer 17

Watt (W)

Question 18

What is the formula for power?

Answer 18

power = energy/time taken

Question 19

What is the formula for energy cosumption?

Answer 19

Electrical energy (kWh) = Power (kW) × Time (h)

Question 20

How much Joules (J) is equal to 1kw

Answer 20

1 kWh of electrical energy consumption is equivalent
to 3600 000 J of energy.