Electricity

Question 1

What is meant by a “Electrical conductor”?

Answer 1

A material that lets current flow easily through it.

Question 2

What is meant by an “Electrical insulator”?

Answer 2

A material that does not let current flow easily through it.

Question 3

What is meant by “Voltage”?

Answer 3

The amount of energy supplied to each coulomb of charge passing through the cell.

Question 4

What is meant by “Electrical current”?

Answer 4

The amount of charge flowing past a point in one second.

Question 5

What is meant by “Direct current”?

Answer 5

Electron flow in one direction from negative to positive.

Question 6

What is meant by “Alternating current”?

Answer 6

The direction of electron flow changes back and forth many times a second.

Question 7

What is the value of Mains voltage in the U.K.?

Answer 7

230 V

Question 8

What is the frequency of Mains electricity in the U.K.?

Answer 8

50 Hz

Question 9

What is the function of a Cell or Battery in an electrical circuit?

Answer 9

To provide electrical energy to the circuit.

Question 10

What is the function of a Bulb or Lamp in an electrical circuit?

Answer 10

To convert electrical energy into light energy.

Question 11

What is the function of a Motor in an electrical circuit?

Answer 11

To convert electrical energy into kinetic energy.

Question 12

What is the function of an L.E.D. in an electrical circuit?

Answer 12

To convert electrical energy into light energy.

Question 13

What does L.E.D. stand for?

Answer 13

Light Emitting Diode

Question 14

What does L.D.R. stand for?

Answer 14

Light Dependant Resistor

Question 15

What environmental factor affects an L.D.R.?

Answer 15

Light

Question 16

What environmental factor affects a Thermistor?

Answer 16

Temperature

Question 17

What does an Ammeter measure?

Answer 17

Electrical Current

Question 18

What does a Voltmeter measure?

Answer 18

Voltage

Question 19

What does an Ohmmeter measure?

Answer 19

Resistance

Question 20

What is the function of a capacitor in an electrical circuit?

Answer 20

A device for storing electrical charge.

Question 21

What is the function of a Transistor in an electrical circuit?

Answer 21

Voltage dependant switch

Question 22

What is meant by a “Series” circuit?

Answer 22

Circuit with one path for the current to flow through.

Question 23

What is meant by a “Parallel” circuit?

Answer 23

Circuit with two or more branching paths for the current to flow through.

Question 24

What is meant by “Power”?

Answer 24

The energy used / transferred every second.

Question 25

What is the rule for series voltage?

Answer 25

In a series circuit, the voltage across each component adds to the supply voltage.

Question 26

What is the rule for series current?

Answer 26

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

Question 27

What is the rule for parallel voltage?

Answer 27

In a parallel circuit, the voltage across each branch is equal to the supply voltage.

Question 28

What is the rule for parallel current?

Answer 28

In a parallel circuit, the current through each branch adds to the supply current.

Question 29

What is the purpose of a resistor in series with an LED?

Answer 29

To protect the LED from too large a current.