V.K. Sally Solutions for Chapter: Electricity, Exercise 20: EXERCISE - 3B

In a series circuit, overall resistance is _____(higher/ lesser) than the resistance of the individual resistors.

In a parallel circuit, overall resistance is _____ than resistance of the individual resistors.

What do the following symbol mean in a circuit diagram? (fixed resistor/ variable resistor/ thermistor)

What do the following symbol mean in the circuit diagram?

(Choose from these: Open switch/Closed switch)

The graph shown alongside is plotted between $V$ and $I$ values. What would be the values of $\frac{V}{I}$ ratio, when potential difference is $0.8 \mathrm{V}, 1.2 \mathrm{V}$ and $1.6 \mathrm{V}$. What conclusion do you draw from these values?  

Two resistors with resistances $5 \mathrm{\Omega }$ and $10 \mathrm{\Omega }$ respectively are connected to a battery of e.m.f. $6 \mathrm{V}$ so as to obtain minimum current flowing. Calculate the strength of the total current in the circuit. 

Two resistors with resistances $5 \mathrm{\Omega }$ and $10 \mathrm{\Omega }$ respectively are connected to a battery of e.m.f. $6 \mathrm{V}$ so as to obtain maximum current flowing. How will you connect the resistances?

Two resistors with resistances $5 \mathrm{\Omega }$ and $10 \mathrm{\Omega }$ respectively are connected to a battery of e.m.f. $6 \mathrm{V}$ so as to obtain maximum current flowing. Calculate the strength of total current in circuit.