Resistors

By-product of resistance

Heat

Resistors are rated for….

Resistance, Tolerance, Wattage

A component with the ability to control current flow electrically

An Active Device

Resistors in series are connected

End to End, in a straight line.

Resistors in parallel are connected

Side by side, across

Resistors connected in series are used as

Voltage Dividers

Voltage Divider Formula

V1=(R1/RT) * VT

Total resistance in series can be calculated by obtaining

The sum of the individual loads

Total resistance in a parrallel brach or circuit will be less then the

lowest value of resistance

If all the resistors in parallel are equal value the formula for calculating total resistance is

Resistor value / Number of resistors

General Formula for Calculating Total Resistance in a Parallel Circut

1/ 1/R1 + 1/R2 + 1/R3

Parallel resistor circuts act as

Current Dividers

For a parallel circuit, the smaller the braches resistor value

The greater the current flow

Current Divider Formula

I_x=(R_T * I_T)/R_x

Resistance Formula for a Individual Load

R_x=(R_t*I_t)/I_x

Series-Parallel circuits combine resistors in ----- with resistors in --—

Series, parallel

Total resistance in a Series-Parallel circuit

Is the total resistance of the parallel branches plus the resistors in series.

If R3 is short

Circuit becomes a parralel circuit.

If R1 is open

It becomes a series circut