Electrical
Real electrical engineering questions, solved step by step Every question below was submitted by a real student and answered step by step.
Runtime equals energy divided by power: 36.129 Wh gives about 4.5 h at 8 W, 3.6 h at 10 W, 2.4 h at 15 W and 1.4 h at 25 W, before efficiency losses.
The total resistance is 12/4 = 3 ohms, so 1/R2 = 1/3 - 1/6 and R2 = 6 ohms. Includes the branch-current check and why the answer cannot be a series circuit.
The 8-minterm expression reduces from 32 literals to 6 terms and 20 literals. Two of the minterms are isolated on the K-map, but the other six pair up into 2-cell groups.
The answer is S = A.B.C. In Boolean algebra X + X = X, so a repeated product term collapses to one copy - unlike ordinary algebra, where it would double.
Answer: 120 V. Series resistances add to 10 ohms, and Ohm law V = IR gives 12 x 10 = 120 V. In parallel the same resistors would total 1 ohm and need only 12 V.