In the diagram above, if each of the resistors can dissip...
In the diagram above, if each of the resistors can dissipate a maximum of 18W without becoming excessively heated, what is the maximum power the circuit can dissipate?
27W
18W
9W
5W
Correct answer is A
From the above diagram, if each of the resistors can dissipate a maximum of 18W, the from the relation power, P = I2R, the current in the 2Ω series resistor is given by:
I2 = P/R = 18/2 = 9 => I = √9 = 3A
The effective parallel arrangement of the two 2Ω resistors: 1/R = 1/2 + 1/2 = 1Ω
∴ Total resistance in the circuit = 1 + 2 = 3Ω
current flowing the circuit = 3A
∴ Maxi. power = P = I2R = 32 x 3 = 27W
Similar Questions
Non-luminous object can be seen because they ...
A resistor with fixed resistance value is called a ...
A car starts from rest and covers a distance of 40 m in 10 s. Calculate the magnitude of i...
Quantities of heat Q can be measured using a container called ...
In which of the following is the expansion of solids a disadvantage? ...