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Chapter 14: Problem 2098

The coil of a choke in a circuit (a) Increase the current (b) Decrease the current (c) Does not change the current (d) Has high resistance to a circuit

Short Answer

Expert verified
Based on the analysis, the coil of a choke in a circuit can (a) increase the current, (b) decrease the current, or (d) have high resistance to a circuit depending on the choke's specific scenario. However, option (c) does not change the current is less likely as chokes typically affect the current passing through them in some way.

Step by step solution

01

Understanding a choke (inductor)

A choke, which is an inductor, stores energy in the form of a magnetic field when current passes through it. In a circuit, a choke allows lower frequency (or direct current) to pass smoothly, while it obstructs (or chokes) higher-frequency alternating current (AC). This behavior can have different results in a circuit as mentioned below. 2.
02

Analyzing the effect on the current#a

If the coil of a choke in a circuit is used to (a) increase the current, it means that more direct current is supplied to the choke. Since a choke allows low frequency or direct current to pass through without much hindrance, as the direct current increases, the choke doesn't pose much resistance, and the current increases as well. 3.
03

Analyzing the effect on the current#b

If the coil of a choke in a circuit is used to (b) decrease the current, it means that either the direct current supplied to it is reduced or the frequency of the alternating current is increased. When the direct current is decreased, the choke allows the remaining current to pass through, subsequently decreasing the overall current in the circuit. Similarly, when the frequency of the AC increases, the choke's impedance increases, creating more resistance for the AC current, which leads to a decrease in the overall current. 4.
04

Analyzing the effect on the current#c

If the coil of a choke in a circuit (c) does not change the current, it would mean that the choke's presence in the circuit does not affect the current passing through it either way. This situation can happen when a choke is in resonance with an applied frequency or the AC current provided to it has no frequency component that the choke would obstruct. 5.
05

Analyzing the effect on the current#d

If the coil of a choke in a circuit (d) has high resistance, it would mean that the impedance offered by the choke is high for the particular frequency applied to it. When this happens, the choke obstructs the AC current, allowing a smaller current to pass through, which would be observed as a high resistance in the circuit. From the above analysis, we can conclude that (a) Increase the current, (b) Decrease the current, and (d) Has high resistance to a circuit, all describe different scenarios where a choke's behavior in a circuit is affected. But option (c) Does not change the current is less likely to happen as chokes will always have some effect on the current passing through them.

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