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 X B R (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)
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ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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Answer the following: iii, iv, v

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
X
B
R
(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.
Transcribed Image Text: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 X B R (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.
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