Question 1 :
100 J of heat is produced each second in a 4 Ω resistance. Find the potential difference across the resistor.
Question 3 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d3d273b230584979bc8.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 current in the cicruit.
Question 4 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d3e273b230584979bca.jpg' /> In the above diagram, $R_{1}$= 10 Ω, $R_{2}$= 40 Ω, $R_{3}$ = 30 Ω, $R_{4}$= 20 Ω,$R_{5}$ = 60 Ω, and a 12 V battery is connected to the arrangement. Calculate the total resistance in the circuit.
Question 7 :
The potential difference between the terminals of an electric heater is 60 V when it draws a current of 4 A from the source. What current will the heater draw if the potential difference is increased to 120 V?
Question 8 :
How is a voltmeter connected in the circuit to measure the potential difference between two points?
Question 9 :
Which of the following terms does not represent electrical power in a circuit?
Question 10 :
How much power is used in 2$\Omega$ resistor when a 6 V battery is connected in series with 1$\Omega$ and 2$\Omega$ resistors?
Question 12 : <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 13 :
Which among iron and mercury is a better conductor? If resistivity of iron is $10.0 × 10^{–8}$ Ω m and resistivity of mercury is $94.0 × 10^{–8}$ Ω m.
Question 14 : <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 15 :
Several electric bulbs designed to be used on a 220 V electric supply line, are rated 10 W. How many lamps can be connected in parallel with each other across the two wires of 220 V line if the maximum allowable current is 5 A?
Question 16 :
Which uses more energy, a 250 W TV set in 1 hr, or a 1200 W toaster in 10 minutes?
Question 17 :
How much power is used in 2$\Omega$ resistor when a 4 V battery is connected in parallel with 12$\Omega$ and 2$\Omega$ resistors?
Question 18 :
The resistance of an electrical component remains constant while the potential difference across the two ends of the component decreases to half of its former value. What change will occur in the current through it?
Question 19 :
Resistance of a metal wire of length 1 m is 26 Ω at 20°C. If the diameter of the wire is 0.3 mm, what will be the resistivity of the metal at that temperature?
Question 20 :
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 21 : <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 22 : <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 23 :
An electric motor takes 5 A from a 220 V line. Determine the power of the motor.
Question 24 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d38273b230584979bc2.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 current through the circuit.
Question 25 :
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 26 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d36273b230584979bc0.PNG' />
Above image is the symbol of ______ in circuit diagram.
Question 27 :
How much current will an electric bulb draw from a 220 V source, if the resistance of the bulb filament is 1200 Ω?
Question 28 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19cd7273b230584979b52.JPG ' />
In the above electric circuit, find out the effective resistance of two $8\Omega$ resistors in the combination
Question 29 :
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 30 :
Two resistors of resistance $2\Omega \ and \ 4\Omega$ when connected to a battery will have
Question 31 :
In an electrical circuit three incandescent bulbs A, B and C of rating 40 W, 60 W and 100 W respectively are connected in parallel to an electric source . Which of the following is likely to happen regarding their brightness ?
Question 32 :
Which instrument is used to measure electric current in a circuit?
Question 33 :
How much current will an electric heater coil draw from a 220 V source, if the resistance of the heater coil is 100 Ω?
Question 34 :
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 resistance of an electric iron connected to the same source that takes as much current as all three appliances?
Question 36 :
What is the equivalent resistance when 1Ω and 10$^{6}$Ω are connected in parallel?
Question 37 :
A piece of wire of resistance R is cut into five equal parts. These parts are connected in parallel. If equivalent resistance of this combination is R', then find the ratio R/R' is
Question 38 :
How much heat is generated while transferring 96000 coulomb of charge in one hour through a potential difference of 50 V?
Question 39 :
Two conducting wires of 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, the ratio of heat produced in series and parallel combinations would be
Question 40 :
What is the name of a device that helps to maintain a potential difference across a conductor?
Question 41 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d34273b230584979bbe.PNG' />
Above image is the symbol of ______ in circuit diagram.
Question 42 :
Calculate the heat generated while transferring 96000 coulomb of charge in one hour through a potential difference of 50 V.
Question 43 :
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 44 :
What is the highest total resistance that can be secured by combinations of four coils of resistance 4 Ω, 8 Ω, 12 Ω, 24 Ω?
Question 45 :
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 47 :
A copper wire has diameter 0.5 mm and resistivity of $1.6 \times 10^{-8} \Omega m$. What will be the length of this wire to make its resistance 10 $\Omega$?
Question 48 :
An electric iron consumes energy at a rate of 840 W when heating is at the maximum rate and the voltage is 220 V. What is the resistance when heating is at maximum rate?
Question 49 :
How many number of electrons constitute 1 coulomb of charge ?
