Which part of a wattmeter connects in parallel with the load to measure voltage?
Potential coil
Power is the product of voltage and current, so a wattmeter must sense both quantities and therefore uses two separate coils.
The current coil is wound with thick wire and has very low resistance; it is connected in series with the load so the full load current passes through it.
The potential coil, also called the pressure or voltage coil, is wound with many turns of fine wire and has high resistance.
It is connected in parallel across the load so that the load voltage appears across it, and its high resistance limits the small current it draws.
The interaction of the magnetic fields of the two coils produces a deflection proportional to power.
The 'fixed coil' term describes the current coil's construction, not the voltage element, and a shunt capacitor is not a wattmeter part at all.
Hence, the answer is Potential coil.
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