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# Resistance Laws Assignment Help

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Electromagnetism - Resistance Laws

**Resistance Laws**

In series **R**_{s} = R_{1} + R_{2} + ... + R_{n}

In parallel **1/R**_{p} = 1/R_{1} + 1/R_{2} + ... + 1/R_{n}

**R**_{p} = R_{1}R_{2}/(R_{1} + R_{2})

If there are n equal resistances in series **R**_{s} = nR

If there are n equal resistances in parallel **R**_{p} = R/n

Terminal potential **V = ε - Ir** is the potential drop across a resistance.

**r** is internal resistance and **ε** is emf of the cell.

Normally terminal potential is less than emf. But during charging of a cell terminal potential is greater than emf.

**Cell in series: -** if n identical cells each of emf ε are connected in series each having internal resistance r,

Then** I = nε / R + nr** where R is external resistance

**Cells in parallel: -** if n cells (identical) are in parallel each having emf **ε **and internal resistance r.

Cell in mixed grouping m rows of n cells each are connected to an external resistance R. assuming all cells are identical each having emf ε and internal resistance r as shown in

**I = nε/[nr/(m + R)]**

Maximum power is delivered by a cell/source if external resistance = internal resistance.

Maximum current is delivered when short circuited (external resistance = zero).

ExpertsMind.com - Resistance Laws Assignment Help, Resistance Laws Homework Help, Resistance Laws Assignment Tutors, Resistance Laws Solutions, Resistance Laws Answers, Electromagnetism Assignment Tutors

**Resistance Laws**

**R**

_{s}= R_{1}+ R_{2}+ ... + R_{n}

In parallel

**1/R**

_{p}= 1/R_{1}+ 1/R_{2}+ ... + 1/R_{n}

**R**

_{p}= R_{1}R_{2}/(R_{1}+ R_{2})If there are n equal resistances in series

**R**

_{s}= nRIf there are n equal resistances in parallel

**R**

_{p}= R/nTerminal potential

**V = ε - Ir**is the potential drop across a resistance.

**r**is internal resistance and

**ε**is emf of the cell.

Normally terminal potential is less than emf. But during charging of a cell terminal potential is greater than emf.

**Cell in series: -**if n identical cells each of emf ε are connected in series each having internal resistance r,

Then

**I = nε / R + nr**where R is external resistance

**Cells in parallel: -**if n cells (identical) are in parallel each having emf

**ε**and internal resistance r.

Cell in mixed grouping m rows of n cells each are connected to an external resistance R. assuming all cells are identical each having emf ε and internal resistance r as shown in

**I = nε/[nr/(m + R)]**

Maximum power is delivered by a cell/source if external resistance = internal resistance.

Maximum current is delivered when short circuited (external resistance = zero).

ExpertsMind.com - Resistance Laws Assignment Help, Resistance Laws Homework Help, Resistance Laws Assignment Tutors, Resistance Laws Solutions, Resistance Laws Answers, Electromagnetism Assignment Tutors