A diode is a device that allows current to be carried in only one direction (the direction indicated by the arrowhead in its circuit symbol). Find (approximately) in terms of `DeltaV` and R the average power delivered to the diode circuit of the figure. Assume that the diodes are ideal and `DeltaV` is the rms voltage applied to the circuit.

Options

A. `((DeltaV)^(2))/(R ) xx 0.6`
B. `((DeltaV)^(2))/(R ) xx 0.8`
C. `((DeltaV)^(2))/(R ) xx 1.1`
D. `((DeltaV)^(2))/(R ) xx 1.4`

Answer

B

Explanation

When the left end is positive, upper diode conducts and lower diode is cut off.
`R_(eq) = R`
When right end is positive the lower diode conducts.
`R_(eq) = R + (3R)/(4) = (7R)/(4)`
`:.` Power `= ((DeltaV)^(2))/(R ) [1 + (4)/(7)] xx (1)/(2) ~~ ((DeltaV)^(2))/(R ) xx 0.8`