To specify components and troubleshoot circuits, a designer has to understand how four quantities relate. All four are defined in A3.4: voltage is the push, current is the flow it drives, resistance opposes that flow, and power is the rate at which energy is delivered.
Two laws tie the four quantities together: Ohm's law and the power law. You are expected to rearrange and substitute into both.
Ohm's law is the central relationship: the voltage across a component equals the current through it multiplied by its resistance, V = I × R (volts = amps × ohms).
Rearrange for whichever quantity is unknown:
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