Equivalent resistance of N resistors arranged in parallel:
RT=1/∑i=1N1/RiR_T=1/\displaystyle\sum_{i=1}^N1/R_iRT=1/i=1∑N1/Ri
RT=1/(1/5+1/3+1/4)=60/(12+20+15)=60/47≈1.277(Ω)R_T = 1/(1/5 + 1/3 + 1/4) = 60/(12 + 20 + 15) = 60/47 \approx 1.277\quad(\Omega)RT=1/(1/5+1/3+1/4)=60/(12+20+15)=60/47≈1.277(Ω)
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