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Current, Voltage and Resistance

Current is a flow of around the .  Electric current can only flow if there are like in a , where electrons flow throughout the structure of charged ions.

The in a circuit flows from to .  Electrons flow in the the flow of "conventional current".

Resistance

Complete this table:

Voltage (V) Current (A) Resistance (Ohms)
2 6
230 23
6 3
1.5 15
12 4
1.5 5

Choose which graph best represents the labeled components:

 
Long and short wire

The graph with the steeper slope is the wire of the same material as it has a resistance.

Thick and thin wire

The graph with the steeper slope is the wire of the same material as it has a resistance.

 

Match the words with their correct description:

Unit of charge
Measures voltage
More current will flow
Metal wire of high resistance
Reduces current flow
Measures current
Ions dissolved in water
Allows current to flow in one direction only
Unit of voltage
Unit of power
Metal wire of low resistance
Less current will flow

Press the button to check your answers:

Click to go to Ohm's law calculations