Question

Q: An 8.2 V zener diode (8.2 V at 25 C) has a positive temperature coefficient of 0.05 %/C. What is the zener voltage at 80 C?
B 8.34 V
8.0 V
843 V​

Answer 1

$\pink{\texttt{Firstly, ur question is incorrect!!!}}$

$\huge\mathcal\colorbox{pink}{{\color{b}{Ur question must be}}}$

An 8.2 V zener diode (8.2 V at 25 °C) has a positive temperature coefficient of 0.05 %/°C. What is the zener voltage at 60°C ?

$\huge\mathcal\colorbox{pink}{{\color{b}{♡Your Answer♡}}}$

$\pink{\texttt{The change in zener voltage is}}$

$\green{\texttt{ΔVz = Vz + TC × ΔT }}$

$\green{\texttt{= (8.2V)(0.0005/°C)(60°C - 25°C}}$

$\green{\texttt{= (8.2V)(0.005/°C)(35°C)= 144 mV}}$

Notice that 0.05%/°C ie converted to 0.0005/°C.$\blue{\texttt{The change in zener voltage is}}$

$\blue{\texttt{Vz + ΔVz = 8.2 V + 144 mV = 8.34 V}}$

$\orange{\textbf{From where I get to know that ur question is rong}}$

$\orange{\textbf{There was an option of 8.34 V as an answer}}$

$\huge\mathcal\colorbox{pink}{{\color{b}{♡Hope it helps♡}}}$