physics - electricity

Question 1

What is electricity?

Answer 1

Electricity is the presence and flow of electric charge.

Question 2

What is an electric circuit?

Answer 2

An electric circuit is a closed-loop that allows electric current to flow.

Question 3

How do you measure current?

Answer 3

Current is measured in amps (A) using an ammeter placed in series within the circuit.

Question 4

How do you measure voltage?

Answer 4

Voltage is measured in volts (V) using a voltmeter placed in parallel across the component.

Question 5

What happens to current in a series circuit?

Answer 5

In a series circuit, the current remains constant throughout all components.

Question 6

What happens to voltage in a series circuit?

Answer 6

In a series circuit, the total voltage is divided among the components.

Question 7

What is the symbol for a cell?

Answer 7

• | I—-

Question 8

What is the symbol for a battery?

Answer 8

—| I-| I-

Question 9

How is electricity in metal wires caused?

Answer 9

Due to the flow of electrons.

Question 10

What do electrons carry around a circuit?

Answer 10

Carry energy, known as the voltage.

Question 11

State the function of a cell.

Answer 11

Converts chemical energy into electrical energy.

Question 12

State the function of a battery.

Answer 12

More than one cell in series, increases the supply voltage.

Question 13

State the function of a light bulb.

Answer 13

Converts electrical into light and wasted energy.

Question 14

State the function of a switch.

Answer 14

Used to break a circuit and stop the flow of current.

Question 15

State the function of a resistor.

Answer 15

Reduces the flow of current in a circuit.

Question 16

State the function of an ammeter.

Answer 16

Measures the current in a circuit, connected in series.

Question 17

State the function of a voltmeter.

Answer 17

Measures the voltage in a circuit, connected in parallel.

Question 18

State the function of a buzzer.

Answer 18

Converts electrical energy into sound energy.

Question 19

What is a conductor?

Answer 19

A conductor allows electricity to flow through it. This is because it has many free electrons.

Question 20

State examples of a conductor.

Answer 20

Metals, gold, silver, copper.

Question 21

What is a non-conductor?

Answer 21

An insulator does not allow electricity to flow through it. This is because it has few electrons.

Question 22

State examples of a non-conductor.

Answer 22

Non-metals, gases, most plastics.

Question 23

How would a current in a circuit be changed?

Answer 23

Add in more components to change the resistance.

Question 24

Define current.

Answer 24

The rate of flow of charge.

Question 25

True or False: Electric current flows from positive to negative.

Answer 25

True.

Question 26

True or False: Voltage is the measure of the flow of electric charge.

Answer 26

False. Voltage is the measure of electric potential difference.

Question 27

What does a blown fuse indicate in a circuit?

Answer 27

A blown fuse indicates that the circuit has overloaded and broken the fuse to prevent further damage.

Question 28

What is the purpose of a circuit breaker?

Answer 28

A circuit breaker automatically interrupts the flow of electricity to protect against overload or short circuit.

Question 29

In a parallel circuit, how does the current behave?

Answer 29

In a parallel circuit, the total current is the sum of the currents through each branch.

Question 30

In a parallel circuit, how does the voltage behave?

Answer 30

In a parallel circuit, the voltage across each branch is the same.

Question 31

What is static electricity?

Answer 31

Static electricity is the build-up of electric charge on the surface of objects.

Question 32

What does it mean when a circuit is closed?

Answer 32

A closed circuit means that there is a complete path for electric current to flow.

Question 33

What does it mean when a circuit is open?

Answer 33

An open circuit means that there is a break in the path, preventing current from flowing.

Question 34

What role does a power source play in a circuit?

Answer 34

A power source provides the energy necessary to maintain the flow of current.

Question 35

Define what a load is in an electric circuit.

Answer 35

A load is any device that consumes electrical energy, such as a light bulb.

Question 36

What does a voltmeter measure?

Answer 36

A voltmeter measures the electrical potential difference (voltage) between two points.

Question 37

What does an ammeter measure?

Answer 37

An ammeter measures the electric current flowing through a circuit.

Question 38

What can happen if too much current flows through a circuit?

Answer 38

If too much current flows, it can cause overheating, damage, or a fire.

Question 39

What is a short circuit?

Answer 39

A short circuit occurs when there is an unintended path for current to flow, bypassing the normal load.

Question 40

What is a diode?

Answer 40

A diode is a semiconductor device that allows current to flow in one direction only.

Question 41

What is a capacitor?

Answer 41

A capacitor is a device that stores electrical energy temporarily.

Question 42

What does grounding mean in electrical circuits?

Answer 42

Grounding means connecting an electrical circuit to the ground, providing a safe path for excess current.

Question 43

True or False: The ammeter goes next to the cell in a circuit as the current is at its highest there.

Answer 43

False, you can put the ammeter anywhere because the current stays the same.

Question 44

True or False: Current transfers energy provided by blubs.

Answer 44

False, they are provided by either cells or batteries.

Question 45

Explain what the voltage across each bulb would be if one bulb is brighter than the other.

Answer 45

The brighter bulb would have a higher voltage than the others as more energy is converted to light and heat.

Question 46

What is voltage sometimes called?

Answer 46

Potential difference. (p.d.)

Question 47

True or False: the voltage is the same as the difference in energy between two points.

Answer 47

False, voltage is the energy per unit charge.