Unit 3: Electricity

Question 1

What is voltage like in a series circuit?

Answer 1

Combines to give the supply voltage.

Question 2

What is current like in a series circuit?

Answer 2

Same at all points.

Question 3

What is voltage like in a parallel circuit?

Answer 3

Same at all points.

Question 4

What is current like in a parallel circuit?

Answer 4

Combines to give the current from the supply.

Question 5

What is capacitance?

Answer 5

The ratio of charge to voltage for a capacitor; number of coulombs a capacitor can store per volt.

Question 6

What is a capacitor?

Answer 6

An electric device that can store charge and energy in a DC circuit.

Question 7

What is current?

Answer 7

A flow of charge (or electrons)

Question 8

What is the electromotive force?

Answer 8

Number of joules of electrical energy given to each coulomb that passes through the source.

Question 9

What is the frequency?

Answer 9

Number of times something occurs per second; i.e number of complete A.C cycles per second.

Question 10

What is the ideal supply?

Answer 10

Supply that has no internal resistance.

Question 11

What is internal resistance?

Answer 11

Resistant of the material that makes up the cell.

Question 12

What are lost volts?

Answer 12

Potential difference across the internal resistance.

Question 13

What is an open circuit?

Answer 13

A circuit in which no current is drawn.

Question 14

What is Ohm’s law?

Answer 14

Potential difference across a component is proportional to the current flowing through it.

Question 15

What is peak

Answer 15

Maximum current or voltage.

Question 16

What is potential difference?

Answer 16

The voltage; the work done when one coulomb moves between these points.

Question 17

What is r.m.s?

Answer 17

Root mean square; r.m.s A.C voltage is equivalent to the D.C voltage.

Question 18

What is a short circuit?

Answer 18

Path with zero electrical resistance.

Question 19

What is the terminal potential difference?

Answer 19

Voltage measured across the terminal of a power supply.

Question 20

What is voltage?

Answer 20

Another name for potential difference.

Question 21

What is the conduction band?

Answer 21

The band that allows conduction to take lace; in conductors this band is partly filled.

Question 22

What is a conductor?

Answer 22

A material that allows electricity to flow.

Question 23

What is an insulator?

Answer 23

A material that blocks electricity flow.

Question 24

What is an LED?

Answer 24

Light emitting diode. Semiconductor device that gives out photons when current passes through it.

Question 25

What i an n-type semiconductor?

Answer 25

Semiconductor material in which the majority of charge carriers are negative.

Question 26

What is a p-type semiconductor?

Answer 26

Semiconductor material in which the majority of charge carriers are positive.

Question 27

What are semiconductors?

Answer 27

A material that will conduct under certain conditions; the gap between the valence band and conduction band is narrower than insulators.

Question 28

What is a solar cell?

Answer 28

Semiconductor device that produces a voltage when photons enter the semiconduction junction.

Question 29

What is a valence band?

Answer 29

Highest required band in insulators; in insulators this is full.