7R/15. for example: The analogous equivalent resistance, RS=R1+R2+R3+R4+R5, is equal to the algebraic total of the resistances, which is 20+20+20+20+10=90.
Equivalent resistance: If a single resistance can replace a group of resistances while preserving the circuit's current, that resistance is referred to as the equivalent resistance.
The total of the individual resistances in a series of resistors will equal their equivalent resistance. The Ohm, represented by the symbol Omega, is the unit of resistance.
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