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प्रश्न
Name any two devices, which are working on the heating effect of the electric current.
उत्तर
- Electric heater
- Fuse wire
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संबंधित प्रश्न
Which of the two is connected in series : ammeter or voltmeter?
Consider the circuit given below:
(a) In which circuit are the lamps dimmest?
(b) In which circuit or circuits are the lamps of equal brightness to the lamps in circuit (i)?
(c) Which circuit gives out the maximum light?
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.
60 joules of heat was dissipated in a resistor when 20 C flowed for 5 s. Calculate:
(a) P.d. across the resistor,
(b) Resistance of the resistor, and
(c) Average power dissipated in the resistor.
Explain with the help of a diagram how does 'short circuiting' occur in an electric kettle.
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
State whether the following statement is True or False:
The SI unit of charge is the coulomb.
Problems for practice:
If 3A current flows through a circuit, then convert the current in terms of a milliampere.
