3.3 Electrical Terminology

Question 1

The symbol for Coulombs is?

Answer 1

C

Question 2

The symbol for charge is?

Answer 2

Q

Question 3

What is the formula for Coulombs

Answer 3

1C = 6.25 x 10 to the power 18 Electrons

Question 4

What does Q=3C Mean?

Answer 4

3 Coulombs

Question 5

1 C/s is how many Amps?

Answer 5

1 C/s = 1 A

Question 6

Voltage is a measure of what?

Answer 6

The force of pressure that is applied to electrons to remove them from their orbits and propel along a wire.

Question 7

What is Electromotive force or EMF

Answer 7

Volts

Question 8

The current in a circuit is proportional to?

Answer 8

The voltage driving it through the circuit

Question 9

E is the symbol for?

Answer 9

EMF

Question 10

V is the symbol for?

Answer 10

Volts

Question 11

What is the unit of quantities for electric charge?

Answer 11

The Coulomb

Question 12

If One C per second is equal to 1 amp, if 10 coulombs go around a circuit in 1 second how many amps (current) is there?

Answer 12

10

Question 13

With electron theory current flows from?

Answer 13

The most negative point to the most positive point.

Question 14

Voltage is the measure?

Answer 14

of the force or pressure applied to electrons to remove them from their orbit and propel them along a wire. AKA Electro motive force

Question 15

Current is proportional to?

Answer 15

The voltage driving it through the circuit, doubling the voltage doubles the current, halving the voltage halves the current.

Question 16

What is the symbol for Volts?

Answer 16

V

Question 17

What is the symbol for EMF?

Answer 17

E

Question 18

What does E = 3V mean?

Answer 18

Electromotive force of 3 volts

Question 19

What is the unit of current and how is it defined?

Answer 19

Ampere , current is directly proportional to the voltage driving it around the circuit. twice the voltage = twice the amps. half voltage = half amps

Question 20

What is the unit of force that moves current around the circuit?

Answer 20

The unit of force that Moves the current around the circuit is EMF or Volts

Question 21

What is potential difference?

Answer 21

The measurement of volts between 2 different bodies.

Question 22

How would you measure the PD of a battery?

Answer 22

By measuring the voltage between the positive and negative terminal bodies

Question 23

How can you measure the EMF (V) of a battery?

Answer 23

With a voltmeter or multimeter

Question 24

What is the unit of opposition to current flow and how is it defined?

Answer 24

Ohm (resistance) , current is inversely proportional to the current in a circuit. Doubling Resistance = Halving Current, Halving resistance = doubling current.

Question 25

What factors effect the resistance of a conductor?

Answer 25

1. The length of the wire (proportional) - Longer = more resistance 10m length of wire has double the resistance of a 5 m wire.
2. cross sectional area of the conductor/wire (inversely proportional) - wider = less resistance.
3. Material it is made of
4. the Temperature of the conductor/wire

Question 26

What happens to the resistance of a conductor/wire if the temperature rises?

Answer 26

resistance rises, if its cold resistance is low.

Question 27

What is OHMS law

Answer 27

V = IR

Question 28

Explain Conductance

Answer 28

It is the opposite (Reciprocal) of resistance, it is the ability of a material to CONDUCT current.

Question 29

What is the unit of conductance? and its symbol

Answer 29

Siemens, Symbol = S

Question 30

What is the symbol for conductance?

Answer 30

G, EG: G = 3s means a conductance of 3 siemens