Advertisements
Advertisements
प्रश्न
In an electrical circuit three incandescent bulbs A, B and C of rating 40 W, 60 W and 100 W respectively are connected in parallel to an electric source. Which of the following is likely to happen regarding their brightness?
पर्याय
Brightness of all the bulbs will be the same
Brightness of bulb A will be the maximum
Brightness of bulb B will be more than that of A
Brightness of bulb C will be less than that of B
Advertisements
उत्तर
Brightness of bulb B will be more than that of A
Explanation -
Since all the three bulbs are connected in parallel so potential difference (V) across all the bulbs is same. Power dissipated is given by
`"P" = "V"^2/"R"`
Lower the resistance, higher the power dissipation. Hence higher the brightness.
Out of all the three bulbs, 100 W bulb will have minimum resistance because rated voltage of all the bulbs will be same and its power dissipation is maximum.
Thus, 100 W will have maximum brightness and 40 W bulb will have minimum brightness.
संबंधित प्रश्न
Draw a schematic diagram of a circuit consisting of a battery of three cells of 2 V each, a 5 Ω resistor, an 8 Ω resistor, and a 12 Ω resistor, and a plug key, all connected in series.
Redraw the circuit of question 1, putting in an ammeter to measure the current through the resistors and a voltmeter to measure the potential difference across the 12 Ω resistors. What would be the readings in the ammeter and the voltmeter?
Draw circuit symbols for variable resistance
Draw circuit symbols for
an open switch
Draw circuit symbols for
A closed switch
Draw the labelled diagram of an electric circuit comprising of a cell, a resistance, an ammeter, a voltmeter and a closed switch (or closed plug key). Which of the two has a large resistance : an ammeter or a voltmeter?
Tell the odd one out. Give a proper explanation.
What do you understand by the closed electric circuit
Draw a neat diagram showing a closed electric circuit.
What is the use of earthing wire?
What is electric circuit?
State whether true or false. If false, correct the statement.
Ammeter is connected in parallel in any electric circuit.
A device that is used to break an electric circuit is called ______.
Instead of metal wires, a jute string can be used to make a circuit.
______ is a kind of fish which is able to produce an electric current.
Choose the statement which is not correct in the case of an electric fuse.
Write a short note on the different electrical circuits.
