Question

Example 80. A generator develops an emf of 120 V and has
a terminal potential difference of 115 V, when the armature
current is 25 A. What is the resistance of the armature ?​

Answer 1

$\small{\underline{\sf{\red{Given:\rightarrow}}}}$

• $\bf{E = 120 V, V = 115 V, I = 25 A}$

$\small{\underline{\sf{\pink{Find:\rightarrow}}}}$

• $\bf{resistance}$

$\small{\underline{\sf{\blue{Formula \ used:\rightarrow}}}}$

• $\boxed{\bf{\orange{I= \dfrac{E-V}{R}}}}$

$\sf{where, I = current; R= Resistance; V= Voltage \ and}$

$\sf{ E= emf}$

$\small{\underline{\sf{\green{Formula \ used:\rightarrow}}}}$

$\sf{Putting \ all\ values\ in\ formula}$

$\sf{R= \dfrac{120-115}{25}= \dfrac{5}{25} = \dfrac{1}{5}= 0.2\Omega }$

$\bf{\underline{ \therefore Resistance\ of\ armature \ is\ 0.2\ \Omega.}}$

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