Question 1 :
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 2 :
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 3 :
State true or false: When connected to the same source the current will flow more easily through a thick wire than thin wire.
Question 4 :
An electric iron of resistance 20 ohm takes a current 5 A. Calculate the heat developed in 30 s.
Question 5 :
In an electrical circuit two resistors of $2\Omega \ and \ 4\Omega$ respectively are connected in series to a 6 V battery. The heat dissipated by the $4\Omega$ resistor in 5 s will be
Question 6 :
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. How much current would flow through the 12 ohm resistor?
Question 7 :
An electric heater of resistance 8 Ω draws 15 A from the service mains 2 hours. Calculate the rate at which heat is developed in the heater.
Question 8 :
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 10 : <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 11 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d3c273b230584979bc7.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 $R_{3}$ .
Question 12 :
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 13 :
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 ammeter?
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 Ω resistance, which may be used separately, in series, or in parallel. What is the current when the two coils are used in parallel?
Question 15 :
A copper wire has diameter 0.5 mm and resistivity of $1.6 \times 10^{-8} \Omega m$. How much does the resistance change if the diameter is doubled?
Question 16 :
Compute the heat generated while transferring 96000 C of charge in one hour through a potential difference of 50V?
Question 17 :
A copper wire has diameter 0.5 mm, resistance 10Ω and resistivity $1.6×10^{-8}Ω$m.How much does the resistance change if the diameter is doubled?
Question 19 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d41273b230584979bcd.jpg' /> In the above image,the values of current I flowing in a given resistor for the corresponding values of potential difference V across the resistor are given. Find the mean resistance.
Question 20 : <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 21 :
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 22 : <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 24 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d2e273b230584979bb6.PNG' />
Above image is the symbol of ______ in circuit diagram.
Question 25 :
Will current flow more easily through a thick wire or a thin wire of the same material, when connected to the same source?
Question 28 :
A copper wire has diameter 0.5 mm and resistivity of $1.6×10^{-8}Ω$m. What will be the length of this wire to make its resistance 10 Ω?
Question 29 :
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 30 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d39273b230584979bc4.jpg' /> In 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 potential difference across the conductor.
Question 31 :
How much work is done in moving a charge of 2 C across two points having a potential difference 12 V?
Question 32 :
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 33 :
Which uses more energy, a 250 W TV set in 1 h or a 1200 W toaster in 10 min?
Question 34 : <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 35 :
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 equivalent resistance?
Question 36 : <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 37 : <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 38 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d35273b230584979bbf.PNG' />
Above image is the symbol of ______ in circuit diagram.
Question 39 :
How many 176 ohm resistors (in parallel) are required to carry 5 A on a 220 V line?
Question 40 :
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 41 : <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 42 :
When a 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit. What is the value of the resistance of the resistor?
Question 43 :
An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, What will be the power consumed?
Question 44 :
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 current when heating is at maximum rate?
Question 45 :
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 46 :
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 48 :
What is the equivalent resistance when $10^6\Omega$ , $1\Omega$ and $10^3\Omega$ are connected in parallel?
Question 49 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d2f273b230584979bb8.PNG' />
Above image is the symbol of ______ in circuit diagram.
Question 50 :
State whether the statement is TRUE or FALSE : Parallel arrangement is used in domestic wiring because it provides the same potential difference across each electrical appliance.
