Correct Answer: Option A

Explanation

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

• If the power of a lens is +2.5D. Calculate the radius of curvature (a). 80cm (b). 40cm (c). 25cm (d).... Answer this

  1 Answers   ·   Physics   ·   3 days ago
• Subjects to learn under petroleum engineering? Answer this

  1 Answers   ·   2 days ago
• what is the cut of mark for medical doctor in university and list all the university? Answer this

  1 Answers   ·   23 hours ago