The Equivalent Resistance R of Two Resistances Connected in Parallel $\frac { 1 } { R } = \frac { 1 } { R _ { 1 } } + \frac { 1 } { R _ { 2 } }$

question 84

Multiple Choice

The equivalent resistance R of two resistances connected in parallel is given by $\frac { 1 } { R } = \frac { 1 } { R _ { 1 } } + \frac { 1 } { R _ { 2 } }$ . Find the equivalent resistance for two resistances of 50 ? and 30 ? connected in parallel.

• A) R = 23.8 ?
• B) R  = 18.8 ?
• C) R  = 16.8 ?
• D) R  = 40 ?
• E) R  = 19.2 ?

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