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Sumit does 600 J of work in 10 min and Amit does 300 J of work in 20 min. Calculate the ratio of the powers delivered by them.
Concept: Household Consumption of Electric Energy
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5 bulbs are connected in series in a room. One bulb is fused. It is removed and remaining 4 bulbs are again connected in series to the same circuit. What will be the effect on the following physical quantities? (Increases, Decreases, Remain Same). |
- Resistance
- Intensity of light
Concept: Electric Resistance
A fuse is rated 5 A. Can it be used with a geyser rated 1540 W, 220 V Write Yes or No. Give supporting calculations to justify your answer.
Concept: Electrical Power
The voltage - current readings of a certain material are shown in the table given below:
| Voltage (V) | 10 V | 20 V | 30 V |
| Current (I) | 2 A | 3 A | 4 A |
Study the table.
- State whether the conductor used is ohmic or non-ohmic.
- Justify your answer.
- State Ohm's law.
Concept: Ohm's Law
Study the diagram:
- Calculate the total resistance of the circuit.
- Calculate the current drawn from the cell.
- State whether the current through 10 Ω resistor is greater than, less than or equal to the current through the 12 Ω resistor.
Concept: Internal Resistance of a Cell
The graph of voltage vs current for four different materials is shown below.
Which of these four materials would be used for making filament of bulb?
Concept: Heating Effect of Electric Current
Observe the given circuit diagram and answer the questions that follow:
- Calculate the resistance of the circuit when the key K completes the circuit.
- Calculate the current through 3Ω resistance when the circuit is complete.
Concept: Electric Resistance
Name the color code of the wire which is connected to the metallic body of an appliance.
Concept: Colour Coding of Wires in a Cable
Draw the diagram of a dual control switch when the appliance is switched ‘ON’.
Concept: Circuits with Dual Control Switches (Staircase Wire)
Explain the meaning of the student 'current rating of a fuse is 5A'.
Concept: Fuse
In the transmission of power the voltage of power generated at the generating stations is stepped up from 11kV to 132 kV before it is transmitted. Why?
Concept: Transmission of Power from the Power Generating Station to the Consumer
State the characteristics required in a material to be used as an effective fuse wire.
Concept: Fuse
At what voltage is this current available to our household?
Concept: Precautions to Be Taken While Using Electricity
For a fuse, higher the current rating ________ is the fuse wire.
Concept: Fuse
Name the device used to increase the voltage at a generating station.
Concept: Transmission of Power from the Power Generating Station to the Consumer
Name the wire in a household electrical circuit to which the switch is connected
Concept: Switches
Identify the following wires used in a household circuit: The wire is also called as the phase wire.
Concept: Power Distribution to a House
Identify the following wires used in a household circuit: The wire is connected to the top terminal of a three pin socket.
Concept: Three-pin Plug and Socket
A fuse is rated 8A. Can it be used with an electrical appliance rated 5 KW, 200 V ? Give a reason.
Concept: Fuse
An electric iron is rated 220V, 2kW.
1) if the iron is used for 2h daily find the cost of running it for one week if it costs 4.25 per kWh
2) Why is the fuse absolutely necessary in a power circuit?
Concept: Earthing
