Question

The device used to obtain a fixed resistance in a circuit is​

Answer 1

Answer:

The power transferred to fan is given as P=V

2

/R, where R is the total resistance of the circuit. As power is inversely proportional to total resistance. So for maximum power, the total resistance should be minimum. Total resistance here is R=

6+r

6r

+3. r is the variable resistance.

R is minimum when r=0.

Answer 2

The device is a resistor.

• A resistor is a passive electrical device whose main purpose is to regulate the total flow of an electric current.
• The term fixed resistance refers to a system whose resistance is fixed and cannot be reversed.
• Such resistances are often used to monitor and restrict current in a known circuit, as well as to provide a consistent amount of heat in heating equipment by using the heating effect of electric current.