
Calculating Resistor Values for LED Circuits in Electronics

Interactive Video
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Physics, Mathematics, Science
•
9th - 10th Grade
•
Hard

Patricia Brown
FREE Resource
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10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why is it necessary to use a resistor in a circuit with an LED?
To increase the voltage supplied to the LED
To decrease the voltage to a safe level for the LED
To change the color of the LED
To increase the current flowing through the LED
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the formula used to calculate the resistor value needed in a circuit?
R = (Vs - VL) / I
R = Vs * VL * I
R = (Vs + VL) / I
R = I / (Vs - VL)
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In the example with a single LED, what is the source voltage provided by the battery?
2V
9V
5V
12V
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the calculated resistor value for a single LED circuit with a 9V source and 2V load?
350 ohm
500 ohm
700 ohm
150 ohm
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How do you determine the load voltage in a circuit with multiple LEDs in series?
By multiplying the operating voltage of one LED by the number of LEDs
By dividing the source voltage by the number of LEDs
By adding the operating voltages of all LEDs
By subtracting the operating voltage of one LED from the source voltage
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the resistor value needed for a circuit with three LEDs in series, each with an operating voltage of 2V, and a 9V source?
100 ohm
150 ohm
200 ohm
250 ohm
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the formula to calculate the wattage rating of a resistor?
Watt = Voltage drop / Current
Watt = Voltage drop * Current
Watt = Voltage drop + Current
Watt = Voltage drop - Current
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