My power supply is evolving and now I need to figure out how to measure the power it is delivering. The supply puts out about 10 amps at 12 volts but it is pulsed by a 555 timer chip. I have an amp meter on the front side of the power supply but I think this is measuring average current. I have a scope and can measure the voltage and pulse width so this is easy, but how do I calculate the amps so I can measure total power delivered?