A circuit with a resistance of #8 Omega# has a fuse with a capacity of #3 A#. Can a voltage of #24 V# be applied to the circuit without blowing the fuse?

1 Answer
Feb 2, 2016

No - the fuse will just blow


The current flowing (24/8=3A) is just at the limit of the fuse current and so the fuse should melt and blow unless it has a tolerance outside of 3A. It might just work for a while but any slight fluctuations in the resistance or voltage will likely make it blow. The procedure is always to use a fuse with the next rating up from the maximum current which is expected to flow safely in a circuit.