Week 7 Day 1. Units to be measured and calculated VoltageVoltsV or E ResistanceOhmsR or Ω Current AmpsI or A PowerWattW or P.

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Presentation transcript:

Week 7 Day 1

Units to be measured and calculated VoltageVoltsV or E ResistanceOhmsR or Ω Current AmpsI or A PowerWattW or P

Experiment / Lab7 Parallel DC Circuits Experiment / Lab 8 Rheostats and Potentiometers

Experiment / Lab9 Series – Parallel DON’T Do page 120 Not doing: Experiment / Lab 10 Experiment / Lab 11 Superposition

Keep current set above zero.

Output control so your don’t have to turn the unit on and off.

Parallel function is not for parallel circuits.

Lab 6

Textbook page 139 The first principle to understand about parallel circuits is that the voltage is equal across all components in the circuit.

PARALLEL RESISTORS Two elements or branches are in parallel if they have two points in common.

Textbook page 146 For resistors in parallel total resistance can be determined from the following equation:

Product / Sum

Is = I1 + I2 + I3 conventional flow

Textbook page mW 40.5mW 81mW = 129.6mW 5.5 Power calculations Power is additive in any configuration of resistive circuit: PTotal = P1 + P Pn

MEASURING TOTAL CURRENT

MEASURING CURRENT IDIVIDUAL BRANCH L

Total resistance is less than the smallest resistance. Voltage is the same across all parallel components.

.

Variable Resistor

Multiple current paths

Variable Resistor

Potentiometer Also called a pot; is a 3-terminal resistor with a sliding contact that forms an adjustable voltage divider. Rheostat Two terminals of a variable resistor are used with one end and the wiper acting as a variable resistor.

Potentiometer

Rheostat

We have created multiple current paths. This is a parallel circuit.

Short Circuit

Series parallel

Page 199 For series parallel circuits we have to identify which parts of that circuit are series and which parts are parallel, then selectively apply series and parallel rules.

The double slash (//) symbols represent ”parallel”

Page 202 The ”−−” symbol is used here to represent ”series,” just as the ”//” symbol is used to represent ”parallel.” (R1//R2−−R3//R4)

REDUCE AND RETURN APPROACH

Reduce

Return

10.7 Superposition Theorem page 365

To use the Superposition Theorem eliminate all but one source of power within a network at a time. Using series/parallel analysis determine voltage drops and/or currents within the modified network for each power source separately.

10.7 Superposition Theorem page 365 Then, once voltage drops and/or currents have been determined for each power source working separately, the values are all “superimposed” on top of each other (added algebraically) to find the actual voltage drops/currents with all sources active.