. With reference to v and i defined in Figure 1-2, which of the following statem
ID: 1812448 • Letter: #
Question
. With reference to v and i defined in Figure 1-2, which of the following statements is false?
A. If the supplied power is 30W and v=15 V, the value of i=2 A.
B. If v=-5 V and i=-2mA, the value of R is 2.5 k%u2126.
C. If v=-6 V and R=2 %u2126, the absorbed power is 18 W.
D. If the absorbed power is 100 W and i=2A, the value of v is 50V.
A. If the supplied power is 30W and v=15 V, the value of i=2 A.
B. If v=-5 V and i=-2mA, the value of R is 2.5 k%u2126.
C. If v=-6 V and R=2 %u2126, the absorbed power is 18 W.
D. If the absorbed power is 100 W and i=2A, the value of v is 50V.
Explanation / Answer
A) INCORRECT, power supplied may not be eqaul to power VI. V*I is power dissipated across the resistence. Since no informaton is given about power dissipated, no conclusion can be made regarding the value of current.
B) R = V / I = 5/2.5 = 2 => correct
C) P = V^2 /R = 36/2 =18 => correct
D) V = P/I = 100/2 = 50 => correct
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