When an electric current flows through a wire, a magnetic field appears around the wire.A．

When measuring AC current flow, you must always connect the meter _____.

In an alternating current electrical system, a low system power factor is a direct sign of _____.

The term flood current refers to that time when the water （).A.is flowing towards the land

When centrifuging heavy fuel oil, an important factor to consider is the _____（1) flow rat

When the current flow through a copper wire increases, its _____.A.resistance will decreas

Too much electric current may flow into a circuit as a result either of a fault in the cir