A silicon diode obeys the exponential V–I model. Its current is 1 mA at 0.7 V. With thermal voltage 25.3 mV, find nearest current when voltage is 0.8 V.
In the forward exponential region with the source’s ideality-one model, I₂/I₁=exp[(V₂−V₁)/VT]. Thus I₂=1 mA×exp(.1/.0253)≈52.06 mA, closest to 52 mA, C. The unknown saturation current cancels in the ratio.
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