Advertisements
Advertisements
प्रश्न
The figure shows a circuit. When the circuit is switched on, the ammeter reads 0.5 A.
(i) Calculate the value of the unknown resistor R.
(ii) Calculate the charge passing through the 3 Ω resistor in 120 s.
(iii) Calculate the power dissipated in the 3 Ω resistor.
Advertisements
उत्तर
(i) We know, V = IR'
⇒ 6 = 0.5 × R'
⇒ R' = 12 Ohm
∵ R' = 3 + R
⇒ 12 = 3 + R
⇒ R = 9 Ohm
(ii) Charge, q = i t
⇒ q = 0.5 × 120 = 60 Coulomb
(iii) Power dissipation, p = i2R
p = 0.52 × 3 = 0.75 Watt
संबंधित प्रश्न
What is meant by saying that the potential difference between two points is 1 V?
How much energy is given to each coulomb of charge passing through a 6 V battery?
Which of the following statements correctly defines a volt?
(a) a volt is a joule per ampere.
(b) a volt is a joule per coulomb.
How much work is done when one coulomb charge moves against a potential difference of 1 volt?
Keeping the potential difference constant, the resistance of a circuit is halved. By how much does the current change?
Explain the statement ‘the potential difference between two points is 1 volt’.
The following table shows current in Amperes and potential difference in Volts.
Which law will the graph prove? Explain the law.
Draw a graph of Potential difference (V) versus Current (I) for an ohmic resistor. How can you find the resistance of the resistor from this graph?
Three resistors are connected to a 6 V battery as shown in the figure given below:
Calculate:
(i) the equivalent resistance of the circuit.
(ii) total current in the circuit.
(iii) potential difference across the 7.2 Ω resistor.
Conceptual question.
A bird sitting on a high power electric line is still safe. How?
