Please help me, Engineering.

15. R = R₁ + R₂ + R₃

16.  

Explanation:

15. The equation for the sum of resistances arranged in series is given as follows;

(Series) = R₁ + R₂ + R₃ + ... +

Therefore, the equation for the total resistance, 'R' of 3 series resistors is given as follows;

R = R₁ + R₂ + R₃

Where;

R₁, R₂, and R₃ are the three resistances arranged in series

16. The equation for the sum of resistances arranged in parallel is given as follows;

Therefore, the total resistance, R, of two resistance arranged in parallel is given as follows;

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explanation:

answer:

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