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ISEB Physics for IZZY > Electric circuits > Flashcards

Electric circuits Flashcards

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1
Q

Explain how an electric current flows around a circuit

A
  1. An electric current is a flow of charge
  2. It can only flow if the circuit is complete
  3. The moving charges are electrons which are negatively charged
  4. The current in a circuit is always the same it is never used up
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2
Q

What is another name for voltage?

A

potential difference

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3
Q

What is another name for potential difference

A

voltage

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4
Q

Describe the job of a battery in a circuit?

A

The battery provides the voltage in the circuit which pushes the electrons around making a current flow

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5
Q

Combining batteries does what to the voltage in a circuit?

A

The voltages are combined
eg 2 x 12V batteries gives a voltage of 24V

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6
Q

What units are used for voltage

A

Volts (V)

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7
Q

Describe resistance in a circuit

A

Resistance is anything which slows down the flow of current

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8
Q

What is a component in a circuit

A

Anything you put into it
eg a lamp

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9
Q

How does the number of components in a circuit affect the current?

A

The more components the higher the resistance and the slower the current

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10
Q

Will a good conductor of electricity have high or low resistance?

A

The better the conductor the lower the resistance.

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11
Q

What type of energy does a battery contain?

A

Chemical energy

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12
Q

Describe how batteries transfer energy to other components

A
  1. The chemical energy in the battery is transformed into electrical energy
  2. The electrical energy is transferred to the components
  3. The component, such as bulbs transform the electrical energy into other forms such as light and heat
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13
Q

Explain why an ammeter may be connected to a circuit

A
  1. An ammeter measures the current flowing through a circuit in amps (A)
  2. You put an ammeter into a circuit in line with the other components, it doesnt need it’s own loop
  3. The current through the ammeter is the same as the other components in the circuit such as a bulb.
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14
Q

Explain why an voltmeter may be connected to a circuit

A
  1. A voltmeter measures voltage in Volts (V)
    You put a voltmeter into it’s own loop below the component you want to know the voltage of eg a bulb
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15
Q

State the component

A

Electromagnet

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16
Q

State the component

A

Reed switch

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17
Q

State the component

A

simple on off switch

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18
Q

State the component

A

Ammeter

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19
Q

State the component

A

Variable resistor

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20
Q

State the component

A

Resistor

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21
Q

State the component

A

Battery

22
Q

State the component

A

Push button switch

23
Q

State the component

A

LED- light emitting diode

24
Q

State the component

A

Lamp

25
Q

State the component

A

Light dependent resistor

26
Q

State the component

A

Semi conductor diode

27
Q

State the component

A

Junction of conductors

28
Q

State the component

A

fuse

29
Q

What is the role of the component?

A

Breaks the circuit if the current is too high

30
Q

What is the role of the component?

A

reduces current flowing through the circuit

31
Q

What is the role of the component?

A

switch controlled by a magnetic field

32
Q

State the component

A

Relay

33
Q

State the component

A

Terminals

34
Q

State the component

A

Buzzer

35
Q

What is the role of the component?

A

switch controlled by an electromagnet

36
Q

What is the role of the component?

A

Coil of wire with magnetic field

37
Q

What is the role of the component?

A

only lets the current flow in one direction

38
Q

What is the role of the component?

A

Resistance decreases when light is shone onto it

39
Q

What is the role of the component?

A

Lights up when current it passed through

40
Q

What is the difference between series and parallel circuits?

A

In series circuits the electricity can only flow one way whereas in parallel circuits it can take different routes

41
Q

What are the characteristics of a series circuit

A
  1. The current is the same everywhere on the circuit
  2. The voltages across the components add up to make the voltage of the battery or cell
  3. The current only takes one route through all of the components
42
Q

What are the characteristics of a parallel circuit?

A

The current has a choice of different routes
The current splits between each of the routes
The voltage across each bulb is the same

43
Q

What type of circuit is this?

A

Series circuit

44
Q

Give the equation for the voltages on this series circuit

A

Vs = V1 + V2

45
Q

What will the ammeters show about the current on this series circuit?

A

I = I1 = I2
They will all read the same

46
Q

What type of circuit is this?

A

Parallel

47
Q

Which ammeter values will be the same?

A

A1 and A5

48
Q

What is the relationship between A1 and A2,3 and 4

A

A1 = A2 + A3 + A4

49
Q

This is a picture of an AND circuit
Explain what needs to happen to light the bulb

A

Switch 1 AND switch 2 both need to be closed to complete the circuit

50
Q

This is a gif of a parallel OR circuit
Explain what needs to happen to light the bulb

A

Switch 1 OR switch 2 need to be closed to complete the circuit

ISEB Physics for IZZY (8 decks)

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