Advertisements
Advertisements
प्रश्न
A bulb marked 12 V, 24 W operates on a 12 volt car battery for 20 minutes. Calculate:
(i) The current flowing through it, and
(ii) The energy liberated.
Advertisements
उत्तर
Given, Voltage = 12 V, power = 24 W, time = 20 mins. = 1200 s.
(i) Currrent, I = `"P"/"V" = 24/12` = 2 A
(ii) energy liberated, H = VIt = 12 x 2 x 1200 = 28,800 J
APPEARS IN
संबंधित प्रश्न
Draw the electrical symbols of the following components and state its use:
Ammeter.
A Radio Set Draws a Current of 0.36 a for 15 Minutes. Calculate the Amount of Electric Charge that Flows Through the Circuit.
(a) With the help of a circuit diagram, obtain the relation for the equivalent resistance of two resistances connected in parallel.
(b) In the circuit diagram shown below, find:
(i) Total resistance.
(ii) Current shown by the ammeter A
Give three reasons why different electrical appliances in a domestic circuit are connected in parallel.
Tick(✓) the correct choice in the following:
A three pin plug is connected to the lead for a 1 kW electric iron to be
used on a 250 V supply. Which of the following statements is not correct?
An electric kettle has a heating element which is rated at 2 kW when connected to a 250 V electric supply. Calculate the
(a) Current which flows in the element when it is connected to a 250 V supply,
(b) Resistance of the filament,
(c) Heat produced in 1 minute by the element,
(d) Cost of running the kettle for 10 minutes a day for 30 days of the month, at the rate of Rs. 3.00 per unit.
At the time of short circuit, the electric current in the circuit ______.
State the conditions for the flow of charge in a circuit from one point to the other.
State whether true or false. If false, correct the statement.
Current can produce magnetic field.
