From week 3 Ic = 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:

From week 3

Ic =

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

Chapter 4 SCIENTIFIC NOTATION AND METRIC PREFIXES

Chapter 5 will be next Subjects in blue not yet needed 5.1 What are ”series” and ”parallel” circuits? Simple series circuits Simple parallel circuits Conductance Power calculations Correct use of Ohm’s Law Component failure analysis Building simple resistor circuits

5.2 Simple series circuits The first principle to understand about series circuits is that the amount of current is the same through any component in the circuit.

Calculating I total by calculating R total first. R total = R1 + R2 + R3 R total = 3 kΩ + 10 kΩ + 5 kΩ R total = 18 kΩ

Page 137 Chapter 5

Textbook page 148

Voltage Divider Rule (VDR) The voltage across a resistor in a series circuit is equal to the value of that resistor divided by the total resistance times the total applied voltage.

R # / R T * V s = V R# R1/ RT x Vs = VR1 R2/ RT x Vs = VR2 R3/ RT x Vs = VR3

Textbook page 180

V AB

Kirchhoff’s Voltage Law (KVL) The algebraic sum of the potential rises and drops around a closed path (or closed loop) is zero. Textbook page 179

Watts Power

Vs= 12V I T =.008A P T =.008 x 12 =.096 = 96mW P R1 =.008 x 8 =.064 = 64mW P R2 =.008 x 4 =.032 = 32mW

Resistance is measured “across” a device in question. R or Ω Voltage sources must be removed.

Lab 4 page 56 Exercise 2

A B C RTRT

Anode: the positive terminal. Cathode: the negative terminal.

Series DC Voltage Sources The connection of batteries in series to obtain a higher voltage is common in much of today’s portable electronic equipment.

Series DC Voltage Sources

V AB V BA V BC V AD

Batteries have a low internal resistance, connecting batteries of different voltages in parallel can cause a current to flow from the higher voltage battery into the lower voltage battery. The large current could potentially damage one or both batteries.

R 1 / R T x Vs = V R1 V out = V R2

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Experiment / Lab 4 Series Resistance