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प्रश्न
Tell the odd one out. Give a proper explanation.
Find the odd one out:
पर्याय
Voltmeter
Ammeter
Galvanometer
Thermometer
उत्तर
Thermometer
Explanation:
It is an instrument for measuring the temperature of a body. The rest of the three are electrical instruments based on the phenomenon of electromagnetism and are used for measuring some electrical parameters such as current and voltage.
Notes
संबंधित प्रश्न
In which direction does conventional current flow around a circuit?
The p.d. across a 3 Ω resistor is 6 V. The current flowing in the resistor will be:
(a) `1/2A`
(b) 1 A
(c) 2 A
(d) 6 A
If the lamps are both the same in the figure given below and if A1 reads 0.50 A, what do A2, A3, A4 and A5 read?
Two lamps, one rated 40 W at 220 V and the other 60 W at 220 V, are connected in parallel to the electric supply at 220 V.
(a) Draw a circuit diagram to show the connections.
(b) Calculate the current drawn from the electric supply.
(c) Calculate the total energy consumed by the two lamps together when they operate for one hour.
Calculate the equivalent resistance between A and B in the adjacent diagram.
Find the effective resistance in the following circuit diagrams (Fig.):
A current of 0.3 A is flowing through a branch of 6 Ω resistors in a junction as shown in fig. . Calculate the
(a) P.d. across the junction XY,
(b) Current flowing through 9Ω and 24Ω
( c) P.d. across 24 Ω resistor, and
( d) e.m.f. of the cell.
The circuit diagram (Fig.) shows a battery of e.m.f. 6 volts and internal
resistance of 0.8 Ω oonnected in series. Find the
(a) Current reoorded by the ammeter,
(b) P.d. across the terminals of the resistor B,
( c) Current passing through each of the resistors B, C and D, and
( d) P.d. across the terminals of the battery.
A 3 pin mains plug is fitted to the lead for a 1 kW electric kettle to be used on a 250 V A.C. supply. Which of the following statements is NOT correct?
(a) A 13 A fuse is the most appropriate value to use.
(b) The brown wire should be connected to the live side of the mains.
An electric iron is rated 750 W, 230 V. Calculate the electrical energy consumed by the press in 16 hours.
An electric bulb is rated 250 W, 230 V.
- the energy consumed in one hour, and
- the time in which the bulb will consume 1.0 kWh energy when connected to 230 V mains.
What is meant by internal resistance of a cell?
State the condition when it is advantageous to connect cells in parallel.
Small amounts of electrical current are measured in milliampere (mA). How many milliampere are there in 0.25 A ?
The power of an electric device is a product of ______ and ______.
