Solve for η
\eta =50
V\neq 0
Solve for V
V\neq 0
\eta =50\text{ and }V\neq 0
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\eta =50\times \left(\frac{24V-0}{24V+0V}\right)^{2}
Anything times zero gives zero.
\eta =50\times \left(\frac{24V-0}{24V+0}\right)^{2}
Anything times zero gives zero.
\eta =50\times \left(\frac{24V-0}{24V}\right)^{2}
Anything plus zero gives itself.
\eta =50\times \left(\frac{24V}{24V}\right)^{2}
Factor the expressions that are not already factored in \frac{24V-0}{24V}.
\eta =50\times 1^{2}
Cancel out 24V in both numerator and denominator.
\eta =50\times 1
Calculate 1 to the power of 2 and get 1.
\eta =50
Multiply 50 and 1 to get 50.
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