Question 1 :
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 3 :
What is the name of a device that helps to maintain a potential difference across a conductor?
Question 5 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d3b273b230584979bc6.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 $R_{2}$.
Question 6 :
An electric bulb is rated 220 V and 100 W. What will be the power consumed if it is operated on 110V?
Question 8 :
An electric heater of resistance 8 Ω draws 15 A from the service mains 2 hours. What is the rate at which heat is developed in the heater?
Question 9 :
How many number of electrons constitute 1 coulomb of charge ?
Question 10 :
Calculate the power used in the 2 Ω resistor in the circuit containing a a 4 V battery in parallel with 12 Ω and 2 Ω resistors.
Question 11 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19c79273b230584979ae6.jpg' />
In the above image, electrical resistivity of some substances at 20° C is given. Which material is the best conductor?
Question 13 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d3d273b230584979bc9.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 total circuit resistance.
Question 14 :
A circuit consisting of a battery of three cells of 2 V each, a 5 Ω resistor, an 8 Ω resistor, and a 12 Ω resistor, and a plug key, all connected in series. What would be the readings in ammeter?
Question 17 :
A circuit consisting of a battery of three cells of 2 V each, a 5 Ω resistor, an 8 Ω resistor, and a 12 Ω resistor, and a plug key, all connected in series. If the voltmeter is connected across 12 Ω resistor,what would be the readings in voltmeter?
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 :
An electric iron of resistance 20 Ω takes a current of 5 A. How much heat is developed in 30 s?
Question 20 :
An electric motor takes 5 A from a 220 V line. Determine the power of the motor and the energy consumed in 2 h.
Question 21 :
When a 12 V battery is connected across a unknown resistor, there is a current of 2.5 mA in the circuit. Find the value of resistance.
Question 22 :
An electric iron consumes energy at a rate of 360 W when the heating is at the minimum and the voltage is 220 V. What is the resistance when heating is at minimum rate?
Question 23 :
Two lamps, one rated at 100W-220 V and other 60 W-220 V are connected in parallel to electric mains supply. What current is drawn from the line, if supply voltage is 220 V ?
Question 24 :
In series combination of resistors, the current is _____in every part of
the circuit.
Question 25 :
What is the lowest total resistance that can be secured by combinations of four coils of resistance 4 Ω, 8 Ω, 12 Ω, 24 Ω?
Question 26 :
A battery of 9 V is connected in series with resistors of 0.2 $\Omega$, 0.3 $\Omega$, 0.4 $\Omega$ , 0.5 $\Omega$ and 12 $\Omega$, respectively. How much current would flow through the 12 $\Omega$ resistor?
Question 27 :
A current of 0.5 A is drawn by a filament of an electric bulb for 10 minutes. Find the amount of electric charge that flows through the circuit?
Question 28 :
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 30 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d30273b230584979bb9.PNG' />
Above image is the symbol of ______ in circuit diagram.
Question 31 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d37273b230584979bc1.jpg' /> In the above figure, an electric lamp, whose resistance is 20 Ω, and a conductor of 4 Ω resistance are connected to a 6 V battery. Calculate the total resistance of the circuit.
Question 32 :
An electric motor takes 5 A from a 220 V line. What is the power of the motor?
Question 33 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d31273b230584979bba.PNG' />
Above image is the symbol of ______ in circuit diagram.
Question 34 :
Several electric bulb designed to be used on a 220 V electric supply line are rated at 10 W. How many lamps are connected in parallel with each other across two wires 220 V line, if the maximum allowable current is 5 A?
Question 35 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d74273b230584979c08.PNG' />
In the above image, Which material is the best conductor?
Question 36 :
In a schematic diagram of a circuit consisting of a battery of three cells of 2 V each, a 5 ohm resistor, a 8 ohm resistor and a 12 ohm resistor and a plug key, all connected in series and put an ammeter to measure the current through the resistors and a voltmeter to measure the potential difference across 12 ohm resistor. What will be the readings in ammeter?
Question 37 :
What is the commercial unit of electrical energy (Represent it in terms of joules) ?
Question 38 :
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 39 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19cd9273b230584979b54.JPG ' />
In the above electric circuit, find out the potential difference across $4\Omega$ resistance .
Question 40 :
What determines the rate at which energy is delivered by a current?
