Advertisements
Advertisements
प्रश्न
A current of 0.2 A flows through a wire whose ends are at a potential difference of 15 V. Calculate:
(i) The resistance of the wire, and
(ii) The heat energy produced in 1 minute.
Advertisements
उत्तर
Given, current, I= 0.2 A; p.d. = 15 V
(i) A/C to Ohm's law
V=IR
R = `"v"/"I" = 15/0.2 = 75 Omega`
(ii) energy produced in one minutes is:
H=I2 Rt = (0.2)2 x 75 x 60 =180 J
APPEARS IN
संबंधित प्रश्न
Name a device that helps to maintain a potential difference across a conductor.
Calculate the quantity of heat produced in a 20 Ω resistor carrying 2.5 A current in 5 minutes.
The p.d. across a lamp is 12 V. How many joules of electrical energy are changed into heat and light when: a current of 2 A flows through it for 10 s?
What is Ohm's law? Explain how it is used to define the unit of resistance.
Why do electricians wear rubber hand gloves while working with electricity?
In the circuit shown below:
The potential difference across the 3 Ω resistor is:
If the potential difference between the end of a wire of fixed resistance is doubled, by how much does the electric power increase?
Calculate the power used in the 2 Ω resistor in each of the following circuits: a 4 V battery in parallel with 12 Ω and 2 Ω resistors.
Explain the statement ‘the potential difference between two points is 1 volt’.
Define electric potential and potential difference.
