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Physics electricity > electricity > Flashcards

electricity Flashcards

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1
Q

What is electric current

A

The flow of electrons

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2
Q

State the equation linking charge, current and time. include units

A

q=i/t Charge(coulombs), Current (Amps), Time (seconds)

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3
Q

What can be said about the value of current at any point in a single closed loop

A

Current is the same at all points in a closed circuit

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4
Q

What two factors does the current in a circuit depend on

A

Potential difference (v)
Resistance (r)

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5
Q

What equation should be used to calculate potential difference if current and resistance are known? State the units for all 3 quantities

A

v=i/r Potential difference (v), Current (a), Resistance (Ω)

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6
Q

What is an ‘Ohmic conductor’

A

A conductor for which current and potential difference are directly proportional

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7
Q

What happens to the resistance of a filament lamp as the temperature increases

A

Resistance increases

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8
Q

What is different about current flow through diode

A

The current only flows through one direction

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9
Q

State what happens to the resistance of a thermistor as temperature increases

A

The thermistors resistance decreases

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10
Q

State what happens to the resistance of a LDR as light intensity decreases

A

The LDR’s resistance increases

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11
Q

What is one way a component can be connected in a circuit (part one)

A

Series

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12
Q

What is one way a component can be connected in a circuit (part two)

A

Parallel

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13
Q

How does the potential difference across two two components vary when connected in series

A

Total potential difference is shared between each component

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14
Q

How does the potential difference across two two components vary when connected in parallel

A

Potential difference across each component is the same

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15
Q

If two resistors are connected in parallel, what can be said about their combined total resistance

A

Their total resistance is less than the smallest of the two individual resistances

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16
Q

If two resistors are connected in series, what can be said about their combined total resistance

A

Their total combined resistance is equal to the sum of the two individual resistances

17
Q

Describe the current in a series circuit

A

In a series circuit, the current is the same at all positions since the charge only has one path to flow through

18
Q

Describe the current in a parallel circuit

A

Ina parallel circuit, the current is shared between the different branches. When the charge reaches a junction it splits

19
Q

How do you connect an ammeter

A

In series with other components

20
Q

How do you connect a voltmeter

A

They should be connected in parallel to other components

Physics electricity (1 decks)

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