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CE Predict/Explain A fuse is a device to protect a circuit
Chapter 21, Problem 35P(choose chapter or problem)
Problem 35P
CE Predict/Explain A fuse is a device to protect a circuit from the effects of a large current. The fuse is a small strip of metal that burns through when the current in it exceeds a certain value, thus producing an open circuit,
(a) Should a fuse be connected in series or in parallel with the circuit it is intended to protect?
(b) Choose the best explanation from among the following:
I. Either connection is acceptable; the main tiling is to have a fuse in the circuit.
II. The fuse should be connected in parallel, otherwise it will interrupt the current in the circuit.
III. With the fuse connected in series, the current in the circuit drops to zero as soon as the fuse bruns through.
Questions & Answers
QUESTION:
Problem 35P
CE Predict/Explain A fuse is a device to protect a circuit from the effects of a large current. The fuse is a small strip of metal that burns through when the current in it exceeds a certain value, thus producing an open circuit,
(a) Should a fuse be connected in series or in parallel with the circuit it is intended to protect?
(b) Choose the best explanation from among the following:
I. Either connection is acceptable; the main tiling is to have a fuse in the circuit.
II. The fuse should be connected in parallel, otherwise it will interrupt the current in the circuit.
III. With the fuse connected in series, the current in the circuit drops to zero as soon as the fuse bruns through.
ANSWER:
Step 1 of 2
(a)
Here we need to find whether the fuse should be connected in series or parallel with the circuit in order to protect.
The fuse has to be connected in series with the circuit so that, when the fuse burns out due to excess current in the circuit, the flow of current stops in the circuit so that fuse prevents damage. If the fuse is connected in parallel with the circuit, even current will flow after the fuse gets burnt due to excess current. The current flows through other parallel path, so when connected in parallel fuse cannot be used for safety.
Therefore, the fuse has to be connected in series with the circuit in order to use it as protection for preventing damage.