You can calculate amps from watts and volts.
The current I in amps (A) is equal to the power P in watts (W), divided by the voltage V in volts (V):
What is the current in amps when the power consumption is 12 watts and the voltage supply is 12 volts?
12 watts / 12 volts = 1 amps
You can calculate watts from volts and amps.
The power P in watts is equal to the voltage V in volts, times the current I in amps:
What is power consumption in watts when the current is 3A and the voltage supply is 15V?
15 volts × 3 amps = 45 watts
You can calculate volts from watts and amps.
The voltage V in volts is equal to the power P in watts, divided by the current I in amps:
What is the voltage in volts when the power consumption is 100 watts and the current flow is 10 amps?
100 watts / 10 amps = 10 volts