Electricty and Magnetism

Question 1

What is static electricty?

Answer 1

Electricity that builds up in one place.

Question 2

What is current electricity?

Answer 2

Electricity that flows from one place to another.

Question 3

What is the direction of conventional current?

Answer 3

Positive to negative

Question 4

What is the direction of flow of electrons?

Answer 4

Negative to positive

Question 5

What is the difference between an electrical conductor and insulator?

Answer 5

A conductor is an object that electricity can travel through easily, for example metal, and an insulator is an object that doesn’t easily allow electricity to pass through.

Question 6

What is the difference in choice of route between a series and parallel circuit?

Answer 6

In series, the current has no choice of route, however in parallel the current has a choice.

Question 7

What is voltage, the units, what measures voltage?

Answer 7

Voltage measures potential difference, the driving force that pushes current around a circuit, its units is volts (V) using an ammeter.

Question 8

What is current, the units, what measures current?

Answer 8

Current is the flow of charge around a circuit, its measured in amperes, amps, (A) using an ammeter.

Question 9

What is the difference between current in a series and parallel circuit?

Answer 9

Current in a series circuit is the same everywhere, but in a parallel circuit the current will all add up to the ammeter at the top of the circuit.

Question 10

What is the difference between voltage in a series and parallel circuit?

Answer 10

Voltage in a series circuit adds up to the total potential difference of the cell and in a parallel circuit, voltage is the same across all of the components.

Question 11

What is resistance and what is it measured in?

Answer 11

Resistance is anything in a circuit that slows down the flow of current. It’s measured in ohms (Ω).

Question 12

Which has a higher resistance and why?
Conductor and Insulator

Answer 12

Insulators have a high resistance than conductors as insulators are components that make it hard for electricity to pass through them.

Question 13

What is the equation to find the resistance of a component?

Answer 13

Resistance = Potential Difference / Current

Question 14

What is a resistor?

Answer 14

A resistor is an electrical component that limits the amount of electricity in the circuit.

Question 15

What is an LDR?

Answer 15

LDR stands for light-dependent resistor and is a resistor that limits the amount of light in a circuit; light must shine on it to work.

Question 16

What will charge normally do in a circuit?

Answer 16

Charge will not flow if a circuit is incomplete, they normally flow from one place to another and they will always take the easiest route.

Question 17

What is a diode?

Answer 17

A diode is an electrical component that allows light to only shine in one direction.

Question 18

What is an LED?

Answer 18

An LED (light emitting diode) is an electrical component that gives out light when current passes through it.

Question 19

What is the role of switches?

Answer 19

The role of switches is that they can turn the circuit on or off.

Question 20

List some common properties of magnets.

Answer 20

A magnet has two poles (North and South), like poles repel, opposite poles attract, magnets attract objects made up of iron, nickel or cobalt, poles always exist in pairs.

Question 21

How can you make electromagnets?

Answer 21

Electromagnets can be created by wrapping a wire around an iron nail and running current through the wire.

Question 22

List some common uses for electromagnets.

Answer 22

• Electric bells
• Relays in circuits
• Sorting though metals in scrapyards
• MRI scanners
• Maglev trains
• Reed switches in electronic circuits

Question 23

How can you make an electromagnet stronger?

Answer 23

You can make an electromagnet stronger by increasing the current, increasing the number of turns of the coil or adding an iron core.