1. A kettle contains 1.5kg of water at a temperature of 18°C. How much energy is
needed to bring the water to the boil?

water boiling point is usually 100°C so I think we subtract 18 degrees Celsius from 100 degrees Celsius to get 82 degrees Celsius to be the energy needed

continuous conducting path for current, power supply

r = ρ x length / area  

ρ = r x area / length  

ρ is in ohm-meters  

in basic units, it is m³kg/s³a²  

i think this is it.