P16: Electricity Flashcards Preview

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Flashcards in P16: Electricity Deck (31)
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1
Q

Ion

A

A charged atom

2
Q

Rubbing a polythene rod with a dry cloth…

A

Transfers electrons to the surface atoms of rod from the cloth, so the rod becomes negatively charged.

3
Q

Rubbing a perspex rod with a dry cloth…

A

Transfers electrons from the surface atoms of the rod to the cloth, so the rod becomes positively charged.

4
Q
A

Battery.

A cell is necessary to push electrons around a complete circuit. A battery consists of two or more cells.

5
Q
A

Switch.

A switch enables the current in a circuit to be switched on or off.

6
Q
A

Indicator.

An indicator is designed to emit light as a signal when a current passes through it or as a light source such as a bulb.

7
Q
A

Ammeter.

Used to measure current.

8
Q
A

Resistor.

Limits the current in a circuit.

9
Q
A

Variable Resistor.

allows the current to be varied.

10
Q
A

Voltmeter.

Used to measure voltage.

11
Q
A

Diode

allows current through in one direction only.

12
Q
A

LED

Emits light when a current passes through it.

13
Q
A

Fuse

designed to melt and break the circuit if the current through it is greater than a certain amount.

14
Q

__ITTTTTTI__

LLLLLLLI

A

Heater.

Designed to transfer electrical energy to heat the surroundings.

15
Q

What way in a circuit does current flow?

A

+ to -

16
Q

The size of an electric current…

A

… is the rate of flow of an electric charge.

17
Q

What is the unit of electric charge?

A

Coulombs (C)

18
Q

Current =

A

Charge flow (C) / Time taken (s)

19
Q

Potential difference across the component (V) =

A

Energy transferred (J) / Charge (C)

20
Q

What causes resistance?

A

Electrons having to push past lots of vibrating ions in a metal filament.

21
Q

resistance (Ω) =

A

Voltage / Current

22
Q

Define Ohm’s Law

A

The current through a resistor at constant temperature is directly proportional to the voltage across the resistor.

23
Q

2 Non-Ohmic Conductors

A

Filament Bulb

Diode

24
Q

1 Ohmic Conductor

A

Resistor

25
Q
A

Thermistor

A resistor that depends on temperature.

26
Q
A

Light Dependent Resistor

A resistor that depends on the intensity of light.

27
Q

In a series circuit, how much current passes through each component?

A

The same amount.

28
Q

In a series circit, what happens to the voltage?

A

It is shared between all of the components.

29
Q

In a parallel circuit, what happens to the current?

A

It is split up, and runs through separate components.

30
Q

In parallel, what is the voltage like for each component?

A

the same.

31
Q
A