An electric iron operating at 120 volts draws 10. amperes of current. how much heat energy

The complete question is how much heat energy is delivered by the iron in 30 seconds.

Heat is given by IVt, Where I is the current in Amperes, V is the voltage, and t is the time in seconds,

Therefore;

Heat energy = 120 * 10 * 30

= 36000 joules or 36 kJ

Heat energy is measured in joules.