Question

the student then uses the circuits to investigate the safety devices and electric circuits. the diagram below shows three different fuses (fuse x, fuse y, fuse z) used with their current ratings.
(b) what does the current rating of a fuse indicate?
the current rating of a fuse will indicate the maximum current the fuse will carry without melting or the fuse will protect the circuit without melting.
she adds fuse x into circuit 1 as shown in the diagram below.
assume that the fuses x, y and z have no resistance.
(c) suggest whether the brightness of the bulb in circuit 1 increases, decreases or remains the same when fuse x is added.
the brightness of the bulb remains the same.
(d) the student replaces fuse x with fuse y, then with fuse z. state and explain, for each fuse, whether the bulb lights up.
(e) suggest a suitable fuse, x, y or z, to be used in circuits 1, 2 and 3 respectively. each fuse may not be used more than once.
(i) circuit 1
(ii) circuit 2
(iii) circuit 3

Explanation:

The problem involves electrical circuits, fuses, and bulb brightness, which falls under Physics (a subfield of Natural Science). For part (c), since fuses have no resistance (given), adding fuse X (which has no resistance) doesn't change the total resistance of the circuit. Using Ohm's Law ($I = \frac{V}{R}$), the current through the bulb remains the same. Since brightness depends on power ($P = I^2R_{bulb}$) and $I$ and $R_{bulb}$ are constant, the brightness remains the same.

Answer:

The brightness of the bulb in circuit 1 remains the same when fuse X is added.