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Physics I Study Guide
Name_______________________________________
Ch 34 - 35 Current Electricity, Series and Parallel Circuits http://ecc.pisd.edu
I. OBJECTIVES : Upon the completion of this unit you should be able to
1. Distinguish among electrical voltage , current , resistance , power, and energy.
2. Use Ohm’s law to solve basic circuit problems.
3. Understand and distinguish between series and parallel circuits.
4. Demonstrate proficiency in basic wiring techniques, basic circuitry, and the use of
electrical instruments (voltmeter, ammeter, power supply) for taking
measurements.
II. READING ASSIGNMENTS :
Ch. 34 Electric Current pp. 531 - 547
Ch. 35 Electric Circuits pp. 548 - 561
III. WRITTEN ASSIGNMENTS :
DUE DATES
Introduction of Circuits Activity……………………………………………W 2/5
Circuit W orksheet I....................................………..........................…T 2/11
Circuit Lab .............................................................................………..T 2/11
Lab Practical ..........................................................................………..Th 2/13
Circuit W orksheet II..................................................................……….F 2/14
Circuit Test ..........................................................................………….T 2/18
Questions from the book may also be assigned.
IV. APPROXIMATE SCHEDULE
W 2/5
Batteries and Lightbulbs Activity
Th 2/6
Lab results and Ohm’s Law;
F 2/7
Simple and Series Circuits
M 2/10
T 2/11
W 2/12
Th 2/13
F 2/14
Series and Parallel Circuits
Lab : “Simple, Series, Parallel Circuits”
Continue Lab
Lab Practicals and HW problems
Lab Practicals;
M 2/17
T 2/18
Review Circuits
Circuits Test
Series Circuits:
1. Rtotal = R1 + R2 +...
2. The current through each
resistance is the same:
Itotal = I1 = I2 =...
3. The voltage across each
resistance splits up proportionally among the Rs:
Vtotal = V1 + V2 +...
Parallel Circuits:
1. 1/ Rtotal = 1/ R1 + 1/ R2 + …
2. The voltage across each
resistance is the same:
Vtotal = V1 = V2 = ...
3. The current splits up among the
resistances:
Itotal = I1 + I2 + ...
All currents and voltages can be found using Ohm’s Law: V = IR
CIRCUITS ACTIVITY
MATERIALS:
Four “D” batteries
Two light bulbs and bases
Na m e _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Teacher____________________________Pd____
Wires
Voltmeter
PROCEDURE:
1. Measure and record the voltage across each battery (1) __________ (2)____________ (3) ___________ (4) ___________
Draw a sketch of how you connected the voltmeter to the battery:
2. (a) Using one battery, one light bulb on a blue base, and some wires, light the bulb. Draw a sketch:
(b) Light the bulb with two, three, and four batteries. What happens to the brightness of the bulb as you add batteries? Why?
3.
(a) Using four batteries, two light bulbs and their bases, wires, and the switch, connect a circuit in such a way that when you
lift one bulb off of its base (and it goes out), the other bulb also goes out.
(b) Use the voltmeter to measure the voltage across each bulb individually when both are lit, and record the voltage across
each.
________________ _______
_____ _______________________
(c) Draw a sketch of your circuit, including the voltmeter.
(d) If this circuit only had one bulb, would its brightness be brighter or dimmer than the brightness of each of the two bulbs
connected in this circuit? Why?
4.
(a) Using two batteries, two light bulbs and their bases, wires, and the switch, connect a circuit in such a way that when you lift
one bulb off of its base (and it goes out), the other bulb does not go out.
(b) Use the voltmeter to measure the voltage across each bulb individually when both are lit.
_______________________ ___
___________________ ___________
(c) Draw a sketch of your circuit, including the voltmeter.
(d) If this circuit only had one bulb, would its brightness be brighter or dimmer than the brightness of each of the two bulbs
connected in this circuit? Why?
Circuit Symbols:
Circuit Element
Schematic Symbol
wire
current flowing through a wire
switch
one battery
two batteries
light bulb
resistor
voltmeter
ammeter
6. For each circuit sketch above, go back and draw the schematic diagram next to each physical diagram using the symbol for each
element.