Resistance

Parallel combination of 3 and 6 gives effective resistance,
This in series with
2 gives net ressistance as 4

The value of temperature coefficient of resistance is given by

and are in ?C)

The resistance of a metal conductor at temperature is given by where and are temperature coefficients of resistance. is the resistance of conductor at . Their values vary from metal to metal. If the temperature is not sufficiently large which is so in the most practical cases, the above relation may be expressed as (i) Given, From E (i), we have ...(ii) and, ...(iii) or or

The equivalent circuit is given by

Required arrangement is shown in figure.

The equivalent circuit will look like (since the two resistances of and are in series, which form which is in parallel with resistance).

Therefore, the effective resistance is

Current in the circuit,

Current in resistor

As we know that,

An equivalent of the given network is as shown in the figure.
If be the net resistance, then




Hence, current flowing through ammeter is

and are in series. Therefore, same current will flow through all the resistors

Equivalent resistance between A and B = series combination of 1 and 2 in parallel with 3 resistor..

Current in the circuit is I = V/R = 1.5/1.5 =1A.
Since the resistance in arm ACB = resistance in arm AB = 3 , the current divides equally in the two arms. Hence the current through the 3 resistor =I/2 = 0.5 A.

Two resistors are in parallel combination. Their equivalent resistance

Total resistance of the
network
Current through resistor,

Given: The potential difference , and the current . Step 1: Use Ohm's Law Ohm's Law is given by: where: - is the potential difference (voltage), - is the current, - is the resistance. Step 2: Rearranging the formula to solve for resistance Rearranging the formula to solve for : Step 3: Substitute the given values Substitute into the formula: Answer: The correct answer is option (1): 4 .