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Use the Formula 1R=1R1+1R2+1R3\frac { 1 } { R } = \frac { 1 } { R _ { 1 } } + \frac { 1 } { R _ { 2 } } + \frac { 1 } { R _ { 3 } }

Question 29

Multiple Choice

Use the formula 1R=1R1+1R2+1R3\frac { 1 } { R } = \frac { 1 } { R _ { 1 } } + \frac { 1 } { R _ { 2 } } + \frac { 1 } { R _ { 3 } } . Given R=155ΩR = 155 \Omega , R2=900ΩR _ { 2 } = 900 \Omega and R3=690ΩR _ { 3 } = 690 \Omega . Find R1R _ { 1 } .


A) R1=257ΩR _ { 1 } = 257 \Omega
B) R1=307ΩR _ { 1 } = 307 \Omega
C) R1=164ΩR _ { 1 } = 164 \Omega
D) R1=316ΩR _ { 1 } = 316 \Omega
E) R1=192ΩR _ { 1 } = 192 \Omega

Correct Answer:

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