Question 2 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d3a273b230584979bc5.jpg' /> In the above diagram, the resistors $R_{1},R_{2},R_{3}$ have the values 5 Ω, 10 Ω, 30 Ω, respectively, which have been connected to a battery of 12 V. Calculate the current through $R_{1}$.

Question 3 :
A battery of 9 V is connected in series with resistors of 0.2 ohm, 0.3 ohm, 0.4 ohm, 0.5 ohm and 12 ohm, respectively. Find total resistance.

Question 4 :
State true or false: When connected to the same source the current will flow more easily through a thick wire than thin wire.

Question 5 :
A hot plate of an electric oven connected to a 220 V line has two resistance coils A and B, each of 24 Ω resistance, which may be used separately, in series, or in parallel. What is the current when the two coils are used in series?

Question 6 :
An circuit consist of a battery of three cells of 2V each , a $5\Omega$ resistor, an $8\Omega$ resistor, and a $12\Omega$ resistor and a plug key all connected in series. Also there is an ammeter to measure the current through resistors and voltmeter to measure the potential difference across $12\Omega$ resistor. What is the reading of the voltmeter?

Question 7 :
Two lamps, one rated 100 W at 220 V, and the other 60 W at 220 V, are connected in parallel to electric mains supply. What current is drawn from the line if the supply voltage is 220 V?

Question 8 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19c7a273b230584979ae7.jpg' /> In the above image, electrical resistivity of some substances at 20° C is given. Which among iron and mercury is a better conductor?

Question 9 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d73273b230584979c07.PNG' /> In the above image, Which among iron and mercury is a better conductor?

Question 10 :
What is the maximum resistance which can be made using five resistors each of $\frac{1}{5}\Omega$ ?

Question 11 :
A hot plate of an electric oven connected to a 220 V line has two resistance coils A and B, each of 24 $\Omega$ resistance. What is the current when they are used in series?

Question 12 :
An electric lamp of $100\Omega$, a toaster of resistance $50\Omega$, and a water filter of resistance $500\Omega$ are connected in parallel to a 220 V source. What is the current through an electric iron connected to the same source that takes as much current as all three appliances?

Question 13 :
What is the equivalent resistance when 1Ω ,10$^{6}$Ω and $10^{3}$Ω are connected in parallel?

Question 14 :
A hot plate of an electric oven connected to a 220 V line has two resistance coils A and B, each of 24 $\Omega$ resistance. What is the current when they are used in parallel?

Question 15 :
An electric kettle consumes 1 kW of electric power when operated at 220 V . A fuse wire of what rating must be used for it ?

Question 17 :
An electric iron of resistance 20 Ω takes a current of 5 A. Calculate the heat developed in 30 s.

Question 18 :
A wire of given material having length l and area of cross-section A has a resistance of 4 Ω. What would be the resistance of another wire of the same material having length $\frac{l}{2}$ and area of cross-section 2A?

Question 19 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19cdb273b230584979b57.JPG ' /> In the above circuit diagrams, a cell, a resistor, a key and ammeter are arranged. The current recorded in the ammeter will be

Question 20 :
When a 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit. Find the value of the resistance of the resistor.

Question 22 :
What is meant by saying that the potential difference between two points is 1 V?

Question 23 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19cda273b230584979b55.JPG ' /> In the above electric circuit, find out the power dissipated in $4\Omega$ resistor .

Question 25 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d32273b230584979bbb.PNG' /> Above image is the symbol of ______ in circuit diagram.

Question 27 :
What is the highest total resistance that can be secured by combinations of four coils of resistance 4 $\Omega$, 8 $\Omega$, 12 $\Omega$, 24 $\Omega$?

Question 29 :
Two conducting wires of the same material and of equal lengths and equal diameters are first connected in series and then parallel in a circuit across the same potential difference. What would be the ratio of heat produced in series and parallel combinations ?