In this version of the formula triangle, what does "i" stand for? 

Physics for Kids: Ohm's Law

What is the symbol used for current in  a circuit? 

A washing machine has a potential difference of 240V across it. 

To protect it from surges in current that might damage the motor, it needs a fuse. 

the resistance of the mashing machine is 22 Ω. 

What would be the best fuse to choose for this applience?

A fuse has 12A of current passing through it. 

It has 240V of potential difference across it. 

What is the resistance of the fuse? 

(remember: current x resistance = potential difference )