TOPIC 2//Circuits/I-V/Parallel and Series circuit/Current/Resistance Flashcards

You may prefer our related Brainscape-certified flashcards:
1
Q

Define current

A

Flow of electric charge around a closed circuit if there is a potential difference

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Define Potential difference

A

the driving force that pushes the charge round

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Define resistance

A

anything in the circuit which slows the flow of charge down

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

How can you relate current with resistance

A

the Greater the resistence, the smaller the current that flows through

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

How does Charge, time and current relate

A

Q-IT

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is charge measured in

A

Coulumbs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

How does resistance, current and pd relate

A

V=IR

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Describe the IV characteristics of an ohmic conductor

A

at a constant temperature, the current flowing through ohmic conductor is directly proportional to PD across it so resistance doesnt change with current

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Describe IV characteristics of Filament lamp

A

when electrical charge flows through a filament lamp, it transfers some energy to thermal energy store of filament which is designed to heat up so resistance will increase

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Describe IV characteristic of a diode

A

The resistance depends on the direction of the current through a diode which only flows in one direction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Describe the method of investigating resistance

A
  1. Attach 1st crocodile clip to the wire at 0cm
  2. attach 2nd clip at 10cm
  3. write down the length of the wire you are testing
  4. close the switch and record current through wire and PD across it
  5. open switch then move 2nd clip another 10cm along wire
  6. close switch and record new length, current and PD
  7. Repeat this a few times
  8. use measurement of current and pd to calculate resistance. R=V/I
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Describe Ohmic conductors

A

Current through an ohmic conductor at a constant temp is directly proportional to Potential difference so you get a straight line

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Describe Filament lamp

A

as the current increases, the temperature of filament lamp increases, so resistance increases. This means less current can flow per unit pd so graph is a curve

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Describe a Diode

A

Current will only flow through a diode in one direction.The diode has very high resistance in reverse direction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is an LDR

A

a resistor that is dependant on intensity of light
in bright light, resistant falls
in darkness, resistance is highest

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is a Thermistor

A

Temperature dependant resistor
in hot conditions, resistance drops
in cool conditions, resistance goes up

17
Q

what are 4 things about series circuits

A
  1. if you remove or disconnect one component, the circuit is broken and they all stop
  2. potential difference adds up
  3. Current is the same everywhere
  4. Resistance adds up
18
Q

What are the 4 things about parallel circuits

A
  1. if you remove or disconect components, it will hardly affect circuit
  2. potential difference is the same everywhere
  3. Current is shared
  4. Adding a resistor in parallel reduces total resistance
19
Q
A