Match the pairs.

"A" GROUP	"B" GROUP
1. Free electrons	a. $V/R$
2. Current	b. Increases the resistance in the circuit
3. Resistivity	c. Weakly attached
4. Resistance in series	d. $VA/LI$

 

The resistance of a conductor of length $x$ is $r$. If its area of cross section is $a$, what is its resistivity? What is its unit?

Resistances $R_1,R_2,R_3$ and $R_4$ are connected as shown in the figure. $S_1$ and $S_2$  are two keys. Discuss the current flowing in the circuit in the following cases.

Both $S_1,S_2$ are closed.

Resistances $R_1,R_2,R_3$ and $R_4$ are connected as shown in the figure. $S_1,S_2$ are two keys. Discuss the current flowing in the circuit in the following cases.

 Both $S_1,S_2$ are open.

Resistance $R_1,R_2,R_3$ and $R_4$ and are connected as shown in the figure. $S_1,S_2$ are two keys. Discuss the current flowing in the circuit in the following cases.

 $S_1$ is closed but $S_2$ is open.

Three resistances $x_1,x_2,x_3$ are connected in a circuit in different ways. $x$ is the effective resistance. The properties observed for these different ways of connecting $x_1,x_2,x_3$ are given below. Write the way in which they are connected in each case. (I-current, V-potential difference, x-effective resistance)

 Current I flow through $x_1,x_2,x_3$.

Three resistances $x_{1,}{x}_2 , x_3$ are connected in a circuit in different ways. $x$ is the effective resistance. The properties observed for these different ways of connecting $x_{1,}{x}_2,x_3$are given below. Write the way in which they are connected in each case. (I-current, V-potential difference, x-effective resistance)

$x$ is larger than $x_1,x_2,x_3.$

Three resistances $x_{1,}{x}_2 , x_3$ are connected in a circuit in different ways. $x$ is the effective resistance. Write the way in which they $x_{1, }{x}_2, x_3$ are connected in the following case. (I-current, V-potential difference, x-effective resistance)

When $x$ is larger than $x_1,x_2,x_3.$

Three resistances $x_1$ ,$x_2$  and $x_3$ are connected in a circuit in different ways. $x$ is the effective resistance. The properties observed for these different ways of connecting $x_1, x_2, and x_3$ are given below. Write the way in which they are connected in each case. ($\mathrm{I}$-current, $\mathrm{V}$-potential difference, $x$-effective resistance)

 The potential across $x_1, x_2, and x_3$ is the same.