Use the Formula $\frac { 1 } { R } = \frac { 1 } { R _ { 1 } } + \frac { 1 } { R _ { 2 } } + \frac { 1 } { R _ { 3 } }$

question 38

Multiple Choice

Use the formula $\frac { 1 } { R } = \frac { 1 } { R _ { 1 } } + \frac { 1 } { R _ { 2 } } + \frac { 1 } { R _ { 3 } }$ . Given $R = 75 \Omega$ , $R _ { 1 } = 165 \Omega$  and $R _ { 2 } = 275 \Omega$ Find $R _ { 3 }$ .

• A) \(R _ { 3 } = 225 \Omega\)
• B) \(R _ { 3 } = 365 \Omega\)
• C) \(R _ { 3 } = 210 \Omega\)
• D) \(R _ { 3 } = 275 \Omega\)
• E) \(R _ { 3 } = 259 \Omega\)

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