2- Current Electricity

Question 0

What does a cell do?

Answer 0

Pushes electrons around a complete circuit. (A battery plural for cells)

Question 1

How is static electricity caused?

Answer 1

When two insulating materials (sometimes) rub together, electrons move from one to the other. This causes the substance gaining electrons to be negatively charged, and the other to be positively charged (charging by friction) Then the opposites attract and cause static electricity

Question 2

What does a switch do?

Answer 2

Enables the current to be turned on or off

Question 3

What does an indicator (bulb) do?

Answer 3

Emit light as a signal when a current passes through it

Question 4

What does a diode do?

Answer 4

Allows the current to flow in one direction only

Question 5

What does a light emitting diode do? (LED)

Answer 5

Emits light when a current passes through it and allows the current to flow in only one direction

Question 6

What does an ammeter do?

Answer 6

Measure electric current (amps)

Question 7

What does a voltmeter do?

Answer 7

Measure the potential difference (voltage)

Question 8

What does a fixed resistor do?

Answer 8

Limits the current in a circuit

Question 9

What does a variable resistor do?

Answer 9

Allows the current to change (be varied)

Question 10

What does a fuse do?

Answer 10

Melt if the current is greater than a certain amount, breaking the circuit

Question 11

What does a heater do?

Answer 11

Transfer electrical energy to heat the surroundings

Question 12

What does a thermistor do?

Answer 12

Sense heat and change current depending on it

Question 13

What does ‘in series’ mean? Give an example

Answer 13

Components connected in a circuit so that the same current that passes through them are in series with each other (an ammeter and a component)

Question 14

What does ‘in parallel’ mean? Give an example

Answer 14

Components connected in a circuit so that the potential difference is the same across each one. (A voltmeter and a component)

Question 15

What is potential difference/voltage?

Answer 15

The amount of energy associated with charge carriers

Question 16

What is resistance?

Answer 16

The opposition to current flow (it’s unit is ohm)

Question 17

What is a current?

Answer 17

The German word for intensity

The flow/amount of electrical charge carriers

Question 18

What is ohms law?

Answer 18

Current is directly proportional to potential difference

Question 19

What is a filament bulb?

Answer 19

An electrical device designed to produce light

Question 20

What happens as the light or heat or current goes up?

Answer 20

The resistors resistance decreases

Question 21

What is a series circuit?

Answer 21

A circuit where components are one after another with no choice of route, if the circuit were to break then the entire charge will stop flowing

The bigger the resistance, the bigger the potential difference

Question 22

What is a parallel circuit?

Answer 22

Each component is connected across the supply so if there is a break in the circuit, charge can still flow to the other parts.

The bigger the resistance the smaller the current through it