Advertisements
Advertisements
प्रश्न
In the network shown in the following adjacent Figure, calculate the equivalent resistance between the points.
- A and B
- A and C
उत्तर
(a) Rs = r1 + r2 + r3
Rs = 2 + 2 + 2
Rs = 6 Ω
`"R"_1` and `"R"_2` are connected in parallel
`1/"R"=1/"R"_"s"+1/"r"_4 = 1/6 + 1/2 = 4/6 " i.e." 2/3`
R = `3/2`
R = 1.5 Ω
(b) `"R"_("s"_1) = "r"_1 + "r"_2`
`"R"_("s"_1)` = 2 + 2 = 4 Ω
`"R"_("s"_2)` = r3 + r4 = 2 + 2 = 4 Ω
`"R"_1` and `"R"_2` are connected in parallel
`1/"R" =1/"R"_("s"_1) + 1/"R"_("s"_2)`
`1/"R" = 1/4 + 1/4`
`1/"R" = 2/4 ~~ 1/2`
R = 2 Ω
APPEARS IN
संबंधित प्रश्न
A current of 4 A flows around a circuit for 10 s. How much charge flows past a point in the circuit in this time?
What happens to the other bulbs in a series circuit if one bulb blows off?
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?
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.
(d) Which circuit would have less current in it?
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 |
A 720 W heater operates from a 220 V line voltage. Calculate:
(a) The electrical energy consumed by the heater in 3 h.
(b) The cost of electrical energy consumption at the rate of 60 paise per kWh.
Two resistors P and Q of the same material and length but of different thickness are connected in parallel to a battery. The cross- sectional area of P is twice that of Q. What is the ratio of
(a) The resistance of P to the resistance of Q?
(b) The current in P to the current in Q?
Which part of an electrical appliance is earthed?
Water : pipe :: Electric current : ______.
Match the items in column-I to the items in column-II:
| Column - I | Column - II | ||
| (i) | electric current | (a) | volt |
| (ii) | potential difference | (b) | ohm meter |
| (iii) | specific resistance | (c) | watt |
| (iv) | electrical power | (d) | joule |
| (v) | electrical energy | (e) | ampere |
