Electricty

Question 1

What is mains electricity?

Answer 1

Mains electricity is the primary source of electrical power supplied to homes and businesses.

Question 2

What are frayed cables?

Answer 2

Frayed cables are damaged electrical wires that can pose a safety hazard.

Question 3

What happens with an overloaded plug?

Answer 3

An overloaded plug may melt, leading to potential fire hazards.

Question 4

What is the purpose of the live lead pin in a plug?

Answer 4

The live lead pin carries the current to the appliance.

Question 5

What is the function of the earth wire?

Answer 5

The earth wire protects against electric shock.

Question 6

What does a fuse do?

Answer 6

A fuse melts if too much current flows, preventing fire hazards.

Question 7

What are the common fuse ratings?

Answer 7

Common fuse ratings are 3 Amps, 5 Amps, and 13 Amps.

Question 8

What is the formula for calculating power?

Answer 8

Power (P) is calculated using the formula P = J x V.

Question 9

What is the formula for energy transfer?

Answer 9

Energy transfer is calculated as current x voltage x time.

Question 10

What type of current does a battery provide?

Answer 10

A battery provides direct current (DC).

Question 11

What type of current is mains electricity?

Answer 11

Mains electricity is alternating current (AC).

Question 12

What is a closed switch?

Answer 12

A closed switch allows current to flow through a circuit.

Question 13

What is a variable resistor?

Answer 13

A resistor whose resistance can be adjusted.

Question 14

What is a fixed resistor?

Answer 14

A resistor with a constant resistance value.

Question 15

What is a series circuit?

Answer 15

In a series circuit, the current is the same at all points.

Question 16

What happens if one bulb breaks in a series circuit?

Answer 16

If one bulb breaks, both will break.

Question 17

What is a parallel circuit?

Answer 17

In a parallel circuit, the current is divided among branches.

Question 18

What can be controlled independently in a parallel circuit?

Answer 18

Devices can be controlled independently by switches.

Question 19

What does an ammeter measure in a series circuit?

Answer 19

An ammeter measures the current flowing through the circuit.

Question 20

What happens as current increases in a circuit?

Answer 20

As current increases, heat is generated, causing more movement of electrons.

Question 21

What happens to resistance as heat increases?

Answer 21

Increasing heat leads to increasing resistance, which can stop the current.

Question 22

What is the purpose of the organization mentioned?

Answer 22

To help everyone with learning for all kinds of education for over 150 years.

Question 23

What is a diode?

Answer 23

A component that allows current to flow in one direction only.

Question 24

What happens to voltage in a circuit?

Answer 24

Voltage increases as current increases, leading to more heat.

Question 25

What is the formula for resistance?

Answer 25

V = IR

Question 26

What is an LDR?

Answer 26

A Light Dependent Resistor that changes its resistance based on light levels. ## Footnote Resistance decreases when it receives different amounts of light.

Question 27

What is a thermistor?

Answer 27

A resistor that changes its resistance based on temperature. ## Footnote Resistance changes when it receives different amounts of temperature.

Question 28

What happens when two people collide?

Answer 28

When person A and person B collide, they exert forces on each other.

Question 29

How do you calculate the voltage across a resistor?

Answer 29

Use Ohm's Law: V = IR.

Question 30

What is current in relation to electric charge?

Answer 30

Current refers to the flow of electric charge. ## Footnote Example: Current is measured in amperes (A).

Question 31

What is voltage?

Answer 31

Voltage is the energy transferred per charge. ## Footnote Example: Voltage is measured in volts (V).

Question 32

What materials can be charged by friction?

Answer 32

Only insulators such as glass or plastic can be charged by friction.

Question 33

What happens when a negatively charged balloon comes close to a neutral object?

Answer 33

The balloon attracts the neutral object because the charges move away, leaving a positive charge on the object.

Question 34

What is a danger of electrostatics?

Answer 34

Sparks from electrostatics can be dangerous, especially at petrol stations or in factories.

Question 35

How can charged paint be used?

Answer 35

Charged paint can spread as a mist and attract to a charged car. ## Footnote Example: This method is used in car painting to ensure an even coat.