It is the unit used to measure energy or work. The definition is that one joule is equal to the energy used to accelerate a body with a mass of one kilogram, using one newton of force, over a distance of one meter
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Power is measured in watts, or joules per second. So in 90 seconds, 1200 joules of work is equal to 1200/90 watts or 13.3 watts.
No, 15 amps does not equal 1500 joules. Amperes (amps) measure electric current, while joules measure energy. To relate them, you need to know the voltage (in volts) and the time (in seconds) for which the current flows. The formula for electrical energy is ( \text{Energy (Joules)} = \text{Power (Watts)} \times \text{Time (seconds)} ), where power is calculated as ( \text{Voltage (Volts)} \times \text{Current (Amps)} ).
That is called a kilowatt (kW). It is also equal to 1000 joules/second.
Planck's Constant is dimensionally equal to Angular Momentum. The unit is Joules second.
Work is energy, measured in joules. The rate of work, or joules per second, is known as watts, or power.