We wish to hook up an LED to a 12V battery. The LED is red and...
We wish to hook up an LED to a 12V battery. The LED is red and
has a forward
voltage (VF) of 2.1V. The target current for the LED is 15mA.
a. Draw a circuit diagram.
b. What is the ideal value of resistance
Homework Answers
5. A light emitting diode (LED) is a diode that lights up when a current flows across it. The sym...
5. A light emitting diode (LED) is a diode that lights up when a current flows across it. The symbol for an LED is shown below (sometimes wiggly arrows are used to represent the light instead.) For this question we will assume we are working with LEDs that have a turn-on voltage of VoN-1V and a reverse breakdown voltage of VBR-8V a. You hook up a single LED to a power supply that can put out vol tage from -10...
(6) A blue LED with a forward voltage drop of 3.5V is to be energized from a 12 volt battery. To light the blue LED to ful brightness requires a current of 20 mA through the LED. The blue LED has a p...
(6) A blue LED with a forward voltage drop of 3.5V is to be energized from a 12 volt battery. To light the blue LED to ful brightness requires a current of 20 mA through the LED. The blue LED has a peak inverse voltage rating of 5 V. i) Draw the circuit dingram of the arrangement you will use to light the LED to full brightness. (ii What is the value of the resistor you will use in your...
6. LED Alarm Circuit One day, you come back to your dorm to find that your...
6. LED Alarm Circuit One day, you come back to your dorm to find that your favorite candy has been stolen. Determined to catch the perpetrator red-handed, you decide to put the candy inside a kitchen drawer. Using the following circuit design, you would like to turn on a light-emitting diode (LED) "alarm" if the kitchen drawer is opened. Rli LED 2.5V LED Note Rphoto is a photoresistor, which acts like a typical resistor but changes resistance based on the...
power electronics and divices In one application, a 12V battery is to be used to power up six power LEDs connected a...
power electronics and divices
In one application, a 12V battery is to be used to power up six power LEDs connected as shown in Figure 3. The LED parameter is given Table 1. Using the rated parameters as the basis calculation, design a suitable DC-DC converter for this application whereby the inductor current variation must not exceed 50% of the output current whereas the output voltage ripple must be less than 5%. The system uses 200 kHz switching frequency Vo...
(6) A blue LED with a forward voltage drop of 3.5V is to be energized from...
(6) A blue LED with a forward voltage drop of 3.5V is to be energized from a 12 volt battery. To light the blue LED to full brightness requires a current of 20 mA through the LED. The blue LED has a peak inverse voltage rating of 5 V (i) Draw the circuit diagram of the arrangement you will use to light the LED to full brightness (ii) What is the value of the resistor you will use in your...
Research the specification sheet for bright blue light emitting diode (LED). Find the nominal forward voltage...
Research the specification sheet for bright blue light emitting diode (LED). Find the nominal forward voltage (Vf) and forward current (If) from the sheet. Next, connect the LED to 12 volt DC power supply and a resistor in series. You must determine the resistance of the resistor to limit the current to the value found in the specification sheet. Explain what you found and how you calculate the resistance for this circuit
Lab 12 Individual Wrap Up Wrap up question 1: While an ideal battery has no internal...
Lab 12 Individual Wrap Up Wrap up question 1: While an ideal battery has no internal resistance, real batteries do. What effect would it have on a circuit (in terms of battery voltage and current in the circuit) if a battery has a large internal resistance? Explain. Wrap up question 2: Using the potential vs distance around the circuit plot, draw or describe the single loop circuit that it matches (starting in the lower left corner and going clockwise). Label...
an ideal battery has an emf of 12v. if it is connected to a circuit and...
an ideal battery has an emf of 12v. if it is connected to a circuit and creates a current of 4.0 A, what is the power? please explain.
We have a microcontroller (MCU) that operates at 3.3V. We want to connect a pushbutton switch to a digital input and a LED on a digital output. The pushbutton is normally open until pressed. The LED...
We have a microcontroller (MCU) that operates at 3.3V. We want to connect a pushbutton switch to a digital input and a LED on a digital output. The pushbutton is normally open until pressed. The LED has a forward voltage of 2.3V at the operating current of 10mA. We want the input at the microcontroller to go high when the button is pressed. We want the LED to light up when the digital output is low Q5 Explain what two...
23. A 10mH inductor that has 512 of resistance is hooked to 12V battery source for...
23. A 10mH inductor that has 512 of resistance is hooked to 12V battery source for 5ms. What is the characteristic time constant, and the current at that time? 24. An RLC series circuit has a 10.0012, a 10.00mH inductor, and a 10.00uF capacitor, and has a 10V source. a. Find the circuit's impedance and current at 100 Hz. b. Find the resonant frequency of the circuit and the average power dissipated at resonance.
5. A light emitting diode (LED) is a diode that lights up when a current flows across it. The symbol for an LED is shown below (sometimes wiggly arrows are used to represent the light instead.) For this question we will assume we are working with LEDs that have a turn-on voltage of VoN-1V and a reverse breakdown voltage of VBR-8V a. You hook up a single LED to a power supply that can put out vol tage from -10...
(6) A blue LED with a forward voltage drop of 3.5V is to be energized from a 12 volt battery. To light the blue LED to ful brightness requires a current of 20 mA through the LED. The blue LED has a peak inverse voltage rating of 5 V. i) Draw the circuit dingram of the arrangement you will use to light the LED to full brightness. (ii What is the value of the resistor you will use in your...
6. LED Alarm Circuit One day, you come back to your dorm to find that your favorite candy has been stolen. Determined to catch the perpetrator red-handed, you decide to put the candy inside a kitchen drawer. Using the following circuit design, you would like to turn on a light-emitting diode (LED) "alarm" if the kitchen drawer is opened. Rli LED 2.5V LED Note Rphoto is a photoresistor, which acts like a typical resistor but changes resistance based on the...
power electronics and divices
In one application, a 12V battery is to be used to power up six power LEDs connected as shown in Figure 3. The LED parameter is given Table 1. Using the rated parameters as the basis calculation, design a suitable DC-DC converter for this application whereby the inductor current variation must not exceed 50% of the output current whereas the output voltage ripple must be less than 5%. The system uses 200 kHz switching frequency Vo...
(6) A blue LED with a forward voltage drop of 3.5V is to be energized from a 12 volt battery. To light the blue LED to full brightness requires a current of 20 mA through the LED. The blue LED has a peak inverse voltage rating of 5 V (i) Draw the circuit diagram of the arrangement you will use to light the LED to full brightness (ii) What is the value of the resistor you will use in your...
We have a microcontroller (MCU) that operates at 3.3V. We want to connect a pushbutton switch to a digital input and a LED on a digital output. The pushbutton is normally open until pressed. The LED has a forward voltage of 2.3V at the operating current of 10mA. We want the input at the microcontroller to go high when the button is pressed. We want the LED to light up when the digital output is low Q5 Explain what two...
23. A 10mH inductor that has 512 of resistance is hooked to 12V battery source for 5ms. What is the characteristic time constant, and the current at that time? 24. An RLC series circuit has a 10.0012, a 10.00mH inductor, and a 10.00uF capacitor, and has a 10V source. a. Find the circuit's impedance and current at 100 Hz. b. Find the resonant frequency of the circuit and the average power dissipated at resonance.
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