# Current Electricity

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• Created by: Sam Evans
• Created on: 18-03-15 18:16
What sort of charge does an electron have?
Negative
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In terms of electrons, how does an insulator become positively charged?
It loses electrons
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What sort of force will there be between two negatively charged objects?
A repulsive force
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If the current through a component is 0.2A when the potential difference across it is 12 VV, what is its resistance?
60 Ohm's
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The energy transferred to a bulb is 36 J when 8.0 C of charge passes through it. Calculate the potential difference across the bulb.
4.5V
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What is an ohmic conductor?
A conductor that obeys Ohms's law
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Explain the shape of the line on a current-potential difference graph for a diode.
The resistance in one direction is very high, so there is no current. In the opposite direction the resistance is lower so current will flow.
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A series circuit contains a variable resistor. If its resistance is increased, what happens to the pd across it?
The potential difference across it increases
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A 5 Ohm resistor and an 8 Ohm resistor are connected in series. What is their total resistance?
13 Ohms
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Where should an ammeter and a voltmeter be placed in a circuit to measure the current through, and the pd across a resistor?
The ammeter should be placed in series and the voltmeter in parallel with the resistor.
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A 4 Ohm resistor and a 12 Ohm resistor are connected in series with a 12V battery. What is the current in the circuit?
0.75A
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## Other cards in this set

### Card 2

#### Front

In terms of electrons, how does an insulator become positively charged?

#### Back

It loses electrons

### Card 3

#### Front

What sort of force will there be between two negatively charged objects?

### Card 4

#### Front

If the current through a component is 0.2A when the potential difference across it is 12 VV, what is its resistance?

### Card 5

#### Front

The energy transferred to a bulb is 36 J when 8.0 C of charge passes through it. Calculate the potential difference across the bulb.