1. LED flashlights use "white" LEDs which have a diode voltage drop of 4.0V. An LED flashlight has the circuit illustrated and will run off of several AAA batteries that have a 1.5 VDC rating. What is the minimum number of AAA cells are needed to turn on the flashlight. 4/1.5= 2.65 /3 b. Would you arrange the batteries in parallel or in series? Series a. Vdd + LED V

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1. LED flashlights use "white" LEDs which have a diode voltage drop of 4.0V. An LED flashlight has the
circuit illustrated and will run off of several AAA batteries that have a 1.5 VDC rating.
a.
What is the minimum number of AAA cells are needed to
turn on the flashlight. 4/1.5 = 2.65
/3
b. Would you arrange the batteries in parallel or in series?
Series
a. What series resistor will give the specified LED current?
(67 K
70 L
b. What is the power dissipated by the resistor you selected in
part a?
Vdd
fritzing
2. In the previous diagram for an LED circuit, the power supply is a 9V battery and we are using a Red
LED whose voltage drop is 2V. The specification sheet for the LED recommends that the "ON" current
should be 10 milliamps.
c. What is the power dissipated in the LED?
R
+
LED V
1
Transcribed Image Text:1. LED flashlights use "white" LEDs which have a diode voltage drop of 4.0V. An LED flashlight has the circuit illustrated and will run off of several AAA batteries that have a 1.5 VDC rating. a. What is the minimum number of AAA cells are needed to turn on the flashlight. 4/1.5 = 2.65 /3 b. Would you arrange the batteries in parallel or in series? Series a. What series resistor will give the specified LED current? (67 K 70 L b. What is the power dissipated by the resistor you selected in part a? Vdd fritzing 2. In the previous diagram for an LED circuit, the power supply is a 9V battery and we are using a Red LED whose voltage drop is 2V. The specification sheet for the LED recommends that the "ON" current should be 10 milliamps. c. What is the power dissipated in the LED? R + LED V 1
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