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प्रश्न
Draw a circuit diagram showing two lamps, one cell and a switch connected in series.
How can you change the brightness of the lamp?
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उत्तर
The brightness of the lamp can be changed by connecting the lamps in parallel.
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संबंधित प्रश्न
The figure given below shows an electric circuit in which current flows from a 6 V battery through two resistors.
- Are the resistors connected in series with each other or in parallel?
- For each resistors, state the p.d. across it.
- The current flowing from the battery is shared between the two resistors. Which resistor will have bigger share of the current?
- Calculate the effective resistance of the two resistors.
- Calculate the current that flows from the battery.
The following circuit diagram shows three resistors 2 Ω, 4 Ω and R Ω connected to a battery of e.m.f 2V and internal resistance 3 Ω. If the main current of 0.25 A flows through the circuit, find:
- the p.d. across the 4 Ω resistors,
- the p.d. across the internal resistance of the cell,
- the p.d. across the R Ω or 2 Ω resistors, and
- the value of R.
State the relation between work, charge and potential difference for an electric circuit.
The following table shows the current in Amperes and potential differences in Volts.
- Find the average resistance.
- What will be the nature of the graph between the current and potential difference? (Do not draw a graph.)
- Which law will the graph prove? Explain the law.
| V (volts) | I (amp) |
| 4 | 9 |
| 5 | 11.25 |
| 6 | 13.5 |
What would be the danger involved in replacing a blown fuse with the one which would carry a large current?
1 kWh = `(1 "volt" xx 1 "ampere" xx "_________")/1000`
A geyser is rated 1500 W, 250 V. This geyser is connected to 250 V mains. Calculate:
- The current drawn,
- The energy consumed in 50 hours, and
- The cost of energy consumed at ₹ 4.20 per kWh.
What should I choose ___________________
b. for getting protection from electric current.
c. to measure the current in the circuit?
Conventionally, the direction of the current is taken as:
Problems for practice:
If 5A current flows through a circuit, then convert the current in terms of microampere?
Electric current is defined as:
In metallic conductors, the charge carriers responsible for producing electric current are:
The electron was discovered in 1897 by:
Electric current flows through a circuit only when:
