Science
The below figure shows two resistors X and Y connected in series to a battery. The power dissipated for this combination is . When these resistors are connected in parallel to the same battery then the power dissipated is given by . Find out the ratio .
Related Questions
(a) What type of lens always forms a virtual erect and diminished image?
(b) List two uses of such a lens.
The electric circuit (below figure) in a clothes dryer contains two heaters X and Y in parallel. The below figure shows the circuit connected to a 230 V power supply. When both switches are closed, the current in X is 3.5 A.
Analyse the circuit given above and answer the following questions.
(a) Calculate the power developed in heater X.
(b) If the resistance of X is double that of Y calculate the current in heater Y.
We have four resistors A, B, C and D of resistance 3 Ω, 6 Ω, 9 Ω and 12 Ω respectively. Find out the lowest resistance which can be obtained by combining these four resistors.
You are given 2 fuse wires A and B with current ratings 2 A and 5 A, respectively. Justify with reason which of the two would you use with a 1000 W, 220 V room heater?