What voltage would you expect in a 120V circuit across an open fuse?

In a 120V circuit with an open fuse, you would expect the voltage across the open fuse to be approximately 120 volts. This is because the open fuse creates a break in the circuit, preventing current from flowing, but the voltage remains present across the open points. The voltage is effectively the same as the supply voltage since there is no current to drop the voltage across the fuse.