2 Electricity

F79%

Why must the current in the wire be kept small during an investigation into how the resistance of a wire depends on its length?

[1]

So the reading on the ammeter does not go above its full scale

So the potential difference across the wire stays the same throughout

So the charge flowing in the wire is not used up too quickly

So the wire does not heat up, which would change its resistance

F79%

Why must the current in the wire be kept small during an investigation into how the resistance of a wire depends on its length?

[1]

So the reading on the ammeter does not go above its full scale

So the potential difference across the wire stays the same throughout

So the charge flowing in the wire is not used up too quickly

So the wire does not heat up, which would change its resistance

2 Electricity Questions