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Physics > P4 - Circuits > Flashcards

P4 - Circuits Flashcards

1
Q

What letter denotes current? What is current measured in?

A

I
Amperes/Amps (A)

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2
Q

What is current?

A

A measure of the flow of electrons around the circuit.

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3
Q

What letter denotes potential difference? What’s potential difference measured in?

A

V
Volts (V)

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4
Q

What is potential difference?

A

The force driving the flow of electrons.

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5
Q

What letter denotes resistance? What is resistance measured in?

A

R
Ohms

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6
Q

What is resistance?

A

Everything that resists or blocks the flow of electrons.

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7
Q

What way do electrons flow?

A

From the positive terminal to the negative terminal.

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8
Q

What is a power source for an electric circuit?

A

Battery
Cell

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9
Q

Equation that links resistance, potential difference and current?

A

V = IR

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10
Q

If we increase the temperature for wires and resistors what happens to the resistance?

A

Increases

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11
Q

How does a filament lamp look like?

A

A curve

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12
Q

How does a diode lamp look like?

A

Only positive.

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13
Q

How does a fixed resistor graph look like?

A

A straight line.

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14
Q

Define a diode?

A

Only allows current to flow in one direction around the circuit.

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15
Q

What is charge?

A

A measure of the total current that flowed within a certain period of time.

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16
Q

What do we denote charge with? What do we measure charge with?

A

Q
Coulombs. (C).

17
Q

How do we measure charge?

A

Q = IT

18
Q

Why do we need a switch in a circuit?

A

To control the flow of electricity.

19
Q

What happens to a fuse if too much current flows through the circuit?

A

It breaks.

20
Q

How do we add ammeters to a circuit?

A

Connect them to the series.

21
Q

How do we add voltmeters to a circuit?

A

Parallel to the filament lamp.

22
Q

What are LDR’s dependant on?

A

Light

23
Q

What are thermistors dependant on?

A

Temperature.

24
Q

What is a disadvantage of a series circuit?

A

If one component breaks, the whole circuit doesn’t work.

25
Q

What happens to the potential difference in the battery to the rest of the components?

A

Its shared but may not be equal.

26
Q

What happens to the current for the rest of the components?

A

Equal everywhere.

27
Q

How is the p.d shared in a parallel circuit to the components?

A

The components have the same number of volts as the battery each.

28
Q

How is the current shared in a parallel circuit to the components?

A

Shared but not equal.

29
Q

If we add more components in parallel what happens to the resistance?

A

Lower total resistance.

30
Q

Equation for energy power and time?

A

E = PT

31
Q

Equation for energy voltage current and time?

A

E = VIT

32
Q

Equation for energy charge and voltage?

A

E = QV

33
Q

Equation for power current and voltage?

A

P = IV

34
Q

Equation for power current and resistance?

A

P = C^2 x resistance

Physics (2 decks)

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