An iron uses 355 kJ of to press a pair of pants (which takes 4.5 minutes). The iron is plugged into a 120 volt wall outlet.

How much charge passes through the iron?

Question

An iron uses 355 kJ of to press a pair of pants (which takes 4.5 minutes). The iron is plugged into a 120 volt wall outlet.

How much charge passes through the iron?

anonymous · Answer

hey

jamesj · Answer

Power is given by 
$$ P = VI $$

(as units of volts is Joules/Coulomb and the units of current is Coulomb/sec)

Now use the information from the problem to find current $ I $.  Then the amount of charge that passes through the iron is
$$ Q = It  $$

jamesj · Answer

You also need to know that 
Power = (Work)/(Time), 

the units of which are Joules/sec, known as Watts