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प्रश्न
A bulb is connected to a battery of p.d. 4 V and internal resistance 2.5 Ω . A steady current of 0.5 A flows through the circuit. Calculate:
The resistance of the bulb
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उत्तर
Given ,
Voltage , V = 4 V
Resistance of the battery , RB = 2.5 Ω
Current , I = 0.5 A
Total resistance , R = 8 Ω
Resistance of the battery , RB = 2.5 Ω
Resistance of the blub, Rb = 8 - 2.5 Ω = 5.5 Ω
संबंधित प्रश्न
Which of the two is connected in series : ammeter or voltmeter?
Three resistors are connected as shown in the diagram.
Through the resistor 5 ohm, a current of 1 ampere is flowing.
(i) What is the current through the other two resistors?
(ii) What is the p.d. across AB and across AC?
(iii) What is the total resistance
Ten bulbs are connected in a series circuit to a power supply line. Ten identical bulbs are connected in a parallel circuit to an identical power supply line.
(c) In which circuit, if one bulb blows out, all other will stop glowing?
Electrical appliances have voltage and power ratings as listed below. Which
has the larger working resistance?
| Appliances | Voltage (V) | Power (W) |
| (a) Washing machine | 250 | 3000 |
| ( b) Television | 240 | 160 |
| (c)240 | 240 | 1500 |
| ( d) Hair curler | 250 | 20 |
| ( e) Car head lamp | 12 | 36 |
State the S.I. units of electrical power.
An electric bulb is marked '100 W, 250 V'. What information does this convey?
True or False – If False give the correct answer
The representation of the electric current is A
Problems for practice:
If 3A current flows through a circuit, then convert the current in terms of a milliampere.
