Science
As shown in the figure below A and B are two lamps. Lamp A is rated at 12 V, 24W. Lamp B is rated at 6.0 V. When lamp B operates at its rated voltage, the current in it is 3.0 A. The values of R1 and R2 are chosen so that both lamps operate at their rated voltages.
Based on the information given, answer the following.
(a) Calculate the current in Lamp A.
(b) State and give reason for the reading of the Voltmeter.
(c) Calculate the resistance of R2.
(d) Find the value of the resistance R1.
Related Questions
The below circuit is a part of an electrical device. Use the information given in the question to calculate the following.
(a) Potential Difference across R2.
(b) Value of the resistance R2.
(c) Value of resistance R1.
(a) State the law and write the formula connecting the electric current flowing through a conductor and voltage applied across it.
(b) In a household five fans each of 100 W are used for 4 hours and an electric press of 500 W for 2 hours every day. Calculate the cost of using the fans and electric press for 60 days if the cost of 1 unit of electrical energy is Rs. 6.5
(a) State Joules law of heating and write its mathematical expression.
(b) Two resistors of resistances 2 Ω and 4 Ω are connected in
- series
- parallel
with a battery of given potential difference. Compute the ratio of total quantity of heat produced in the combination in the two cases if the total voltage and time are kept the same for both.