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Choose the correct relation for e.m.f. (ε) and terminal voltage V:
Concept: Terminal Voltage of a Cell
'A geyser is rated 240 W-220 V'. Explain the meaning of this statement.
Concept: Power Rating of Common Electrical Appliances
Find the value of current I drawn from the cell.
- Calculate the current I.
- Calculate the terminal voltage.
Concept: Terminal Voltage of a Cell
The potential difference between terminals of a cell in a closed electric circuit is ______.
Concept: Terminal Voltage of a Cell
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: 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: 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
