Question

What is the fixed resistance called?
(A) Rheostat
(B) Resistor
(C) Key
(D) Switch

Answer 1

Hint
As the name implies, a ‘fixed’ resistance’s value cannot be changed dynamically. If used in a circuit, it gives the same value for resistance even if other parameters are altered.

Complete step by step answer
Resistance in an electrical circuit is defined as the opposition inflow experienced by the current. It is measured in ohms. This property is useful in some applications and frowned upon in others. For example, resistance can be helpful to reduce the flow of current in case of a short circuit, but otherwise, it causes more electricity discharge for general usage.
Various combinations of resistances are used to achieve the desired properties in a circuit. The most common alignments include Series, Parallel, and the Wheatstone Bridge. In a Series circuit, the resistances are joined side by side and experience the same current flow, but different voltages across each other. Whereas in a Parallel circuit, the resistances experience the same voltage but the different current for every addition.
There are two main types of resistances that find their usage in an electrical circuit, namely: fixed and variable resistance. Fixed resistances do not change their values even when the temperature and/or voltage rise. These are also called Resistors. These are used to put a constraint on the flow of current through a circuit. Variable resistances can be changed in real-time. Rheostats, potentiometers, and trimmers are the most commonly used variable resistances. These provide control over the flow of current in a circuit in real-time as the current is inversely proportional to resistance, according to Ohm’s Law.
Hence, the answer is (B) i.e. Resistor.

Note
Resistors are very small components. To be able to identify the resistance they carry easily, they are color-coded using stripes. These colors correspond to a specific value of resistance along with some tolerance.