If a resistor is removed then the resistance is decreased, if resistance is decreased the current becomes more. you connect any number of resistors when they are connected in series and even if one is disconnected and there is break in connection there would be No current flowing in the circuit.

A Switch. An electrical switch serves the purpose of controlling the flow of electrical current within a circuit. It can be used to both inhibit the flow of the current or to initiate it.

Nothing happens to the other light bulbs in a parallel circuit when the middle bulb is removed because the other light bulbs still have a connection to the voltage source.

The fuse breaks the circuit if a fault in an appliance causes too much current to flow. This protects the wiring and the appliance if something goes wrong. The fuse contains a piece of wire that melts easily. If the current going through the fuse is too great, the wire heats up until it melts and breaks the circuit.

Classes H, K, and R are “full-size” fuses, often used in motor applications. You’ll find all three classes with voltage ratings of 250V or 600V, while amp ratings range from one-eighth of an amp up to 600A. Class K fuses come in two interrupt ratings: 50,000A and 100,000A.

There are thousands of fuses that have similar dimensions, so you need to be precise when measuring the fuse.

1. Cartridge Fuses: Measure the overall length of the fuse and the diameter of the caps.
2. Bottle Fuses: Measure the overall length of the fuse and the diameter of both caps as the often vary in size.
3. Blade Fuses:

Hence, usually, the electrodes of the DC Fuses are placed at larger distance when compared to the AC Fuses. This will minimize the chance of arc and since the distance between the electrodes is increased, the size of the DC Fuses is comparatively large.

AC fuses will work fine for DC circuits. They depend on a fusible link which simply measures current and melts if the current gets too high. It works the same for DC or AC.

Fuses are first rated by the ac and/or dc circuit voltage into which they can be safely applied. A fuse installed in an AC circuit performs differently than when installed in a DC circuit. Fuses can operate at any voltage below or equal to their rated voltage.

Find the size of fuse by multiplying the amps required by the device (2) by 1.5. 2×1.25 = 2.5 then we will round up to the nearest fuse size (in multiples of 5 amps) which would call for a 5 amp fuse. Cross Reference that fuse size to verify that it’s below the Maximum fuse size called out by this chart.

You can replace a 125V fuse with a 250V fuse of equal amperage as long as the application voltage is 250V or less. You can not replace a 250V fuse with a 125V fuse of equal amperage if the application voltage exceeds the 125V.

Since there is no 0v point, the AC breaker design will NOT work in a DC circuit. The DC breaker uses a magnet to attract the arc, pulling it from the air gap, and extinguishes it. The AC breaker is NOT equiped with a magnet, and cannot extinguish a DC arc.

DC circuit breaker, like their name suggests, is used for the protection of electrical devices that operate with direct current. The main difference between direct current and alternating current is that in DC the voltage output is constant, while in AC it cycles several times per second.

AC devices operated on DC: A motor may have field coils and/or rotor coils both of which may be destroyed by excessive current when DC is applied. In some cases the motor may survive but in almost all cases will not operate.