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# AST 406 Circuits

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### AST 406 Circuits

1. 1. CIRCUITS Objectives: 3.11 Analyze the distribution of current in various combinations of circuit elements 3.12 Explain the distribution of electric potential in various combinations of circuit elements 3.13 Explain the concept of electric potential difference in circuits using an analogical model 3.14 to 3.18 Activities
2. 2. Circuits:  A circuit is made up of a power supply, connecting wires & various elements that allow current to leave a power source, travel through the elements & return back to the power source.
3. 3. Common Electric Symbols  Battery/Power Source  Bulb
4. 4. Common symbols (cont’d)  Switch Push-button Switch  Resistor   Voltmeter  Ammeter V A
5. 5. Circuits Power Supply A v Ammeter Resistor Voltmeter
6. 6. Trick to help identify type of circuit: Series:Pen follows wire Types of Circuits: one direction Parallel: Pen can go in more than  There are 2 types of circuits: 1.  2.  SERIES Series Circuit Parallel Circuit PARALLEL
7. 7. Series or Parallel? 1. 2. PARALLEL SERIES 3. 4. A PARALLEL SERIES A
8. 8. Important Formula to Solve Circuits!!!   Resistance, current intensity & potential difference are all related. Formula: Resistance R V = 1 I Potential Difference Current Intensity VERY IMPORTANT!!!
9. 9. Math – Cross Multiplication Ex. 10 = x 1 2 Diagonal to each other “Friend times friend” “Left-out” 10 x 2 ÷ 1 = 20 “Divided by Foe” x = 20 Always multiply the two numbers that are diagonal from each other together. Then divide by the “left-out” number “Friend by friend divided by foe”
10. 10. REMEMBER Friend x Friend ÷ Foe x 8 = 1.  6 4 2. 3. 4. 6 x 8 ÷ 4 = 12 5 10 = 2 x 10 x 2 ÷ 5 = 4 8 6 = x 3 8x3÷6=4 10 = x 7 10 x = 1 7 10 x 7 ÷ 1 = 12 Sneaky one….anything by itself is considered to be over 1
11. 11. A circuit has a resistance of 10Ω & a current intensity of 5A. What is the potential difference? R 1 R= 10 Ω V= ?V I= 5A 10 1 = V I = ? 5 V = 50V
12. 12. A circuit has a resistance of 20Ω & a potential difference of 100V. What is the current intensity? R = V 1 R= 20 Ω V= 100 V I= ?A I 20 1 = 100 ? I= 5 A
13. 13. A circuit has a potential difference of 16V & a current intensity of 2A. What is the resistance? R 1 R= ?Ω V= 16 V I= 2A ? 1 = V I = 16 2 R= 8 Ω
14. 14. KEY POINTS  Cross multiplication (friend x friend ÷ foe) V  Formula R = 1  I Helpful Summary Chart SERIES PARALLEL SAME DIFFERENT Potential Difference (V) DIFFERENT SAME Resistance (R) Req = R1 + R2 + R3 +… 1 1 1 1 = + + Req R 1 R 2 R 3 Current (I)
15. 15. Electricity and Flowing Water How and why electricity does what it does can be explained by using a river as a comparison. •The water goes downstream because there is a difference in altitude. This is the same as potential difference where a difference in charge exists between two points in a circuit. •The quantity of water in a river can be compared to the current. Lots of water, large current. Little water, small current. •Rocks and boulders found in the stream slow the flow of water. Resistors along the circuit tend to slow the movement of electrons.
16. 16. Activities  Worksheet #11 -13
17. 17. References      Science Quest Student Study Guide http://www.qesnrecit.qc.ca/mst/phs_sc Animation Factory Google Images
18. 18. Alternative Educational Experiences through e-Learning