Controlling and using electric current Flashcards Preview

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Flashcards in Controlling and using electric current Deck (21)
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1
Q

How is the current in a electric circuit measured

A
2
Q

where is the ammeter placed

A
3
Q

how is the potential difference (voltage) across a component is measured

A
4
Q

where is the voltmeter placed in reference to the component

A
5
Q

what is the potential difference

A
6
Q

how does the size of the current change if the potential difference (voltage) of the power is changed

A
7
Q

what happens to a current in a series circuit

A
8
Q

Explain how current is conserved at a junction

A

the number of electrons leaving the junstion each second is the same as the total number arriving each second.

the electrons join up at the end again

9
Q

what is the resistance of a component

A
10
Q

what are the units for resistance

A
11
Q

explain the link between resistance and current

A
12
Q

how can the resistance of a circuit be changed

A
13
Q

Use the equation: potential difference (volt, V) = current (ampere, A) * resistance (ohm, )

A
14
Q

explain the effect of a filament lamp on voltage and resistance

A
15
Q

explain the effect of a diode on voltage and resistance

A
16
Q

explain the effect of a light-dependent resistors on voltage and resistance

A
17
Q

explain the effect of a thermistor on voltage and resistance

A
18
Q

Explain why, when there is an electric current in a resistor, there is an energy transfer which heats the resistor

A
19
Q

Distinguish between the advantages and disadvantages of the heating effect of an electric current

A
20
Q

Use the equation: electrical power (watt, W) = current (ampere, A) * potential difference (volt, V)

A
21
Q

Use the equation: energy transferred (joule, J) = current (ampere, A) * potential difference (volt, V) * time (second, s)

A