Electric Circuits
In 'Electric Circuits Unit 131,' immerse yourself in the world of electrical circuits with detailed explanations and practical examples. Gain a comprehensive understanding of fundamental concepts and explore advanced topics to enhance your knowledge. This unit provides a solid foundation for beginners and serves as a valuable resource for those seeking to deepen their expertise in circuit analysis and design. Dive into the complexities of electric circuits and unlock the potential for innovation and problem-solving in this dynamic field.
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Presentation Transcript
Electric Circuits Unit 13 1
Series and Parallel Circuits Leaning Objectives 1. Explain what series and parallel circuits are 2. Calculate the value of I, V and total resistance in series and parallel circuits 2
Series circuit Series Circuit 3
Series Circuits 1. Current in each component is the same V 2. Potential difference (EMF) across the power-supply in a series circuit is sum of p.d across each of the components V V 3. Total resistance is equal to the sum of all the resistances (R=R1+R2+..) EMF=18V 4
Question1 Q1. The lamp and the variable resistor are in parallel or series? Answer: Series The current in the circuit is 2 A. Q2. What is the value of A1? Answer: 2 A Q3. What is the value of A2? Answer: 2 A 5
Parallel Circuit Series Circuit Parallel Circuit 6 Video
Parallel Circuits V 1. Total current in the main circuit is the sum of the currents in the branches Potential difference across each of the component is the same Total resistance R : 2. 3. V EMF=18V Note: Current in lower value resistor is more then the current in the higher value resistor 7
Question 2 Q1. The two lamps L1 and L2 are in series or parallel? o Parallel Q2. If A2 is 1 A & A3 is 2A, what is A1? o 3 A Q3. Complete the missing items 8
Summary: Series and Parallel Current PD Resistance ??? Series Same Distributed R=R1+R2+R3 Parallel Distributed Same 1/Rt = 1/R1 + 1/R2 + 1/R3 +... Total resistance is always smaller than the smallest resistance 9
Question 3 Q1. The lamp and the variable resistor are in parallel or series? Answer: Series The current in the circuit is 5 A. Q2. What is the value of current in lamp? Answer: 5 A Q3. What is the value of current in variable resistor Answer: 5 A Q4. V1= 1 Volt, calculate V2 Answer: 0.5 Volt Q5. Lamp has a resistance of 2 and Variable resistor has a resistance of 3 . What is the total resistance? Answer: R = R1+R2 = 2 +3 = 5 10
Question 4 Parallel or Series? What is the total resistance? What is the potential difference across 3 ? What is the potential difference across 6 ? What is the current in 3 ? What is the current in 6 ? What is the total current in the circuit? 11
Question 5 12
Question 6 13
Summary: Series and Parallel Current PD Resistance ??? Series Same Distributed R=R1+R2+R3 Parallel Distributed Same 1/Rt = 1/R1 + 1/R2 + 1/R3 +... Total resistance is always smaller than the smallest resistance 16
