Download - G482 Circuit Revision
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• [1] Find the voltage if the resistance is 2K
• [2]Find the Resistance if the current is 150mA and the voltage 0.2V
• [3]Find the voltage if the current is 0.2 A and the resistance is 5Ω𝝁
Note, k x 103 ,m x10-3 , x 10 𝝁 -6
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Practical Skills Ev LEARN THESE
LINK Absolute Uncertainty (Absolute Error)
The absolute uncertainty (usually called absolute error - but "error" connotes "mistake", and these are NOT mistakes) is the size of the range of values in which the "true value" of the measurement probably lies. If a measurement is given as 25.4 ±0.1g, the absolute uncertainty is 0.1 g.
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G482 L19 Circuit Revision
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LO
1. Review Kirchhoff's laws2. Practice using Kirchhoff's 1st ,2nd Laws and Ohms equation
in combined questions. By doing Questions 3. Be able to measure electrical values by construction of
series and parallel circuits. By making and testing circuits.4. Circuit characteristics: correct assembly of series and
parallel resistive circuits using up to three resistors in series, parallel and series – parallel combination; calculation of resistance. By using calculations.
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Starter1 : ReminderWhat are Kirchhoff’s laws ?
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Practice: Find I1,I2 and I3
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Resistors in Series and Parallel Current and Voltages
Review Questions:For the circuits below, what are the unknown p.d.’s and the currents? Show your working
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Resistors in Series and Parallel Current and Voltages
Review Questions:For the circuits below, what are the unknown p.d.’s and the currents? Show your working
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Combination Questions Using 1st,2nd Ohms Equation• Find V , R ,I1 ,V1 then V2
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3 Practice Questions
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Combinations of Resistors
• Resistors In Series• When several resistors, eg. R1, R2, and R3 are connected in series, as above:-• the same current, I, passes through each resistor,• the applied voltage, V, is equal to the sum of the voltages across the separate resistors :• => V = V1 + V2 + V3• the total resistance, R, is the sum of the separate resistors.• => R = R1 + R2 + R3
I V
R1 R2 R3
V2 V3V1
©IPK01
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R = R1 + R2 + R3
• What single resistor could replace the three resistors shown in the diagram below?
• R = R1 + R2 + R3 • = 1.4 + 2.2 + 3.7 • = 7.3kΩ
k k k1.4 2.2 3.7©IPK01
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Resistors In Parallel• When two resistors, e.g. R1 and R2, are
connected in parallel:-
• Remember the voltage across each resistor is the same, V,
• The total current, I, is equal to the sum of the currents in the separate resistors,
I = I1 + I2
• The resulting resistance, R, is given by:-
V
I
R1 R2
I2I1
©IPK01
R1
R1
R1
21
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• What is the total value ?
10
5
k
k ©IPK01
R1
R1
R1
21
OR R = R1 x R2 / R1 + R2
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What do you notice about the total resistance in parallel compared to
the values of the resistors ?
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•Its always LOWER !
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• Complete G482 L19 Electrical Examination Practice Qs
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Homework
• Complete sheet and mark it using Moodle
• G482 L19
• P 132 Q1,2