Which device is used to measure active power in an electrical circuit?

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Active power is the portion of electrical power that actually does work in a circuit. It is measured in watts, and a wattmeter is the instrument used to determine this real power by taking into account both the voltage and current and how they relate in time (the phase angle). This makes watts the direct measure of the useful power delivered. The other terms relate to current, voltage, or resistance themselves (amps, volts, ohms) and do not by themselves quantify the real power without combining them and considering phase. So the correct choice is the unit that represents real power—watts.