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(i) Which connection does the positive terminal of the battery have to be connected to for the LED to glow - A or B? (ii) If the LED is glowing, calculate the value of resistor R so the current is 10 mA when the battery has a voltage of 6 V. (iii) Calculate the power dissipated in the resistor for the conditions outlined in ii). (iv) If the resistor has a power rating of 0.125 W, what is the largest voltage that may be applied to the tester? (v) Add an additional LED to the above circuit such that it will indicate when the other terminal of the battery is positive. Draw the new circuit.

(i) Which connection does the positive terminal of the battery have to be connected to for the LED to glow - A or B? (ii) If the LED is glowing, calculate the value of resistor R so the current is 10 mA when the battery has a voltage of 6 V. (iii) Calculate the power dissipated in the resistor for the conditions outlined in ii). (iv) If the resistor has a power rating of 0.125 W, what is the largest voltage that may be applied to the tester? (v) Add an additional LED to the above circuit such that it will indicate when the other terminal of the battery is positive. Draw the new circuit.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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Answer the following questions, iii, iv and v:

(b) Figure 2.2 shows the circuit of a battery polarity tester using a light emitting diode (LED) and a resistor R. The LED's has a forward voltage drop of 1.4 V. The battery is connected between terminals A and B. A o #4 B R Figure 2.2 (i) Which connection does the positive terminal of the battery have to be connected to for the LED to glow - A or B? (ii) If the LED is glowing, calculate the value of resistor R so the current is 10 mA when the battery has a voltage of 6 V. (iii) Calculate the power dissipated in the resistor for the conditions outlined in ii). (iv) If the resistor has a power rating of 0.125 W, what is the largest voltage that may be applied to the tester? (v) Add an additional LED to the above circuit such that it will indicate when the other terminal of the battery is positive. Draw the new circuit. Your solution should show all of your working out in order to attract full marks.
Transcribed Image Text:(b) Figure 2.2 shows the circuit of a battery polarity tester using a light emitting diode (LED) and a resistor R. The LED's has a forward voltage drop of 1.4 V. The battery is connected between terminals A and B. A o #4 B R Figure 2.2 (i) Which connection does the positive terminal of the battery have to be connected to for the LED to glow - A or B? (ii) If the LED is glowing, calculate the value of resistor R so the current is 10 mA when the battery has a voltage of 6 V. (iii) Calculate the power dissipated in the resistor for the conditions outlined in ii). (iv) If the resistor has a power rating of 0.125 W, what is the largest voltage that may be applied to the tester? (v) Add an additional LED to the above circuit such that it will indicate when the other terminal of the battery is positive. Draw the new circuit. Your solution should show all of your working out in order to attract full marks.
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