Advertisements
Advertisements
प्रश्न
Two cells each of 5V are connected in series across an 8Ω resistor and three parallel resistors of 4Ω, 6Ω, and 12Ω. Draw a circuit diagram for the above arrangement. Calculate
- the current drawn from the cell
- current through each resistor
Advertisements
उत्तर
i) Current drawn from the cell
Eeq = 5+5 = 10V
Reff = Rs+ Rp
Rs = 8 Ω
`1/"R"_"p" = 1/4 + 1/6 + 1/12`
`= (18 + 12 + 6)/72 = 36/72`
∴ Rp = `72/36` = 2 Ω
Reff = 8 + 2 = 10Ω
I = `"E"_"eq"/"R"_"eff" = 10/10 = 1`A
∴ I = 1A
Voltage drop V= IR =1 × 2 = 2V
V = 2V
ii) Current through each resistor:
∴ current in 4Ω resistor
I = 24 = O.5A
I = O.5A
current in 6Ω resistor, I = `2/6` = 0.33 A
I = 0.33A
current in 12Ω resistor, I = `2/12 = 1/6` = 0.17A
I = 0.17A
APPEARS IN
संबंधित प्रश्न
What is an Ohmic resistor?
Name the physical quantity whose unit is "ohm".
In an experiment of verification of Ohm’s law following observations are obtained.
|
Potential difference V (in volt) |
0.5 | 1.0 | 1.5 | 2.0 | 2.5 |
| current I (in ampere) | 0.2 | 0.4 | 0.6 | 0.8 | 1.0 |
Draw a V-I graph and use this graph to find:
- the potential difference V when the current I is 0.5 A,
- the current I when the potential difference V is 0.75 V,
- the resistance in a circuit.
Rewrite the following statement by selecting the correct option.
The S.I. unit of resistance is __________.
State the limitations of Ohm’s law.
Define Current density.
What is ohmic device?
Obtain the macroscopic form of Ohm’s law from its microscopic form and discuss its limitation.
Let the resistance of an electrical device remain constant, while the potential difference across its two ends decreases to one fourth of its initial value. What change will occur in the current through it? State the law which helps us in solving the above stated question.
Why should an ammeter have low resistance?
