Sensors
... • Thermal detectors include a temperature sensitive element, which is heated by incident light. • The photon detectors respond directly to absorbed photons. ...
... • Thermal detectors include a temperature sensitive element, which is heated by incident light. • The photon detectors respond directly to absorbed photons. ...
ER Week11, Other Sources, Photoresistor
... A typical module has 36 cells connected in series to increase the voltage. 36 times ½ volt equals 18 volts. However, the voltage is reduced as the cells get hot in the sun and 12 volt batteries typically need about 14 volts for a charge, so the 36 cell module has become the standard for the solar ba ...
... A typical module has 36 cells connected in series to increase the voltage. 36 times ½ volt equals 18 volts. However, the voltage is reduced as the cells get hot in the sun and 12 volt batteries typically need about 14 volts for a charge, so the 36 cell module has become the standard for the solar ba ...
CirCuits
... They give off light and heat Brightness increases as current increases Since energy is lost as light and heat more voltage is required to have the same current As current increases, resistance increases because the light bulb heats up Voltage ...
... They give off light and heat Brightness increases as current increases Since energy is lost as light and heat more voltage is required to have the same current As current increases, resistance increases because the light bulb heats up Voltage ...
Cricket_project_brl4..
... • The threshold and trigger inputs monitor the capacitor voltage and when it reaches 2/3Vcc (threshold), the output becomes low and the discharge pin is connected to 0V. • The capacitor discharges with current flowing through RB into the discharge pin. When the voltage falls to 1/3Vcc (trigger) the ...
... • The threshold and trigger inputs monitor the capacitor voltage and when it reaches 2/3Vcc (threshold), the output becomes low and the discharge pin is connected to 0V. • The capacitor discharges with current flowing through RB into the discharge pin. When the voltage falls to 1/3Vcc (trigger) the ...
Resistance Review--Principles of Technology
... 4. Dry friction depends on the force that presses two surfaces together and on what other property? ...
... 4. Dry friction depends on the force that presses two surfaces together and on what other property? ...
review quiz 2_26
... For proficiency, there is no vertical velocity. Only ball rolling off a table problems. Example A motorcycle stunt driver zooms off the end of a cliff at 30.0 m/s. If he lands after .75 seconds, what is the height of the cliff? What is the range of the motorcycle/rider? ...
... For proficiency, there is no vertical velocity. Only ball rolling off a table problems. Example A motorcycle stunt driver zooms off the end of a cliff at 30.0 m/s. If he lands after .75 seconds, what is the height of the cliff? What is the range of the motorcycle/rider? ...
Tutorial 1
... heater if the voltage dropped by 10%? 3. The resistance of an electronic component changes from 860Ω to 1.5kΩ when its temperature changes over a certain range. If it is desired to maintain 30mA of current in the component at all times, what range of voltages must a voltage source connected to it be ...
... heater if the voltage dropped by 10%? 3. The resistance of an electronic component changes from 860Ω to 1.5kΩ when its temperature changes over a certain range. If it is desired to maintain 30mA of current in the component at all times, what range of voltages must a voltage source connected to it be ...
EE 201 ELECTRIC CIRCUITS
... Ali has four devices (A, B, C, and D) which should sit on the board and be connected to the voltage source to function. These devices have the following specifications: Internal resistors: RA RB RC RD ...
... Ali has four devices (A, B, C, and D) which should sit on the board and be connected to the voltage source to function. These devices have the following specifications: Internal resistors: RA RB RC RD ...
Section 3 – Input Devices
... 1. describe the energy transformations involved in the following devices: ...
... 1. describe the energy transformations involved in the following devices: ...
Project 2
... Solving for V we get an RMS voltage of 2V or 5.6Vpp. The NJM2113D has a gain of about 30, so its maximum peak-to-peak input voltage should be about 0.2V. Assuming the signal coming from the filter is about 5Vpp, we will need to reduce the signal by a factor of 0.2/5 = 0.04 (for maximum volume). One ...
... Solving for V we get an RMS voltage of 2V or 5.6Vpp. The NJM2113D has a gain of about 30, so its maximum peak-to-peak input voltage should be about 0.2V. Assuming the signal coming from the filter is about 5Vpp, we will need to reduce the signal by a factor of 0.2/5 = 0.04 (for maximum volume). One ...
Current, Voltage and Resistance
... Current, Voltage and Resistance Apply the rules of current and voltage to to following circuits and use the V=IR equation to work out the missing currents, voltages and resistances as required. Unless stated otherwise, assume all bulbs are identical. DON’T FORGET YOUR UNITS! Remember: To work out re ...
... Current, Voltage and Resistance Apply the rules of current and voltage to to following circuits and use the V=IR equation to work out the missing currents, voltages and resistances as required. Unless stated otherwise, assume all bulbs are identical. DON’T FORGET YOUR UNITS! Remember: To work out re ...
Exercise 5
... 1. A photoresistor is a light sensitive resistor. When it’s dark, the photoresistor’s resistance is large; when it’s light, the photoresistor’s resistance is low. Measure and record the photoresistor’s resistance and the current flow through it in both ambient light and in the dark. Cover the top of ...
... 1. A photoresistor is a light sensitive resistor. When it’s dark, the photoresistor’s resistance is large; when it’s light, the photoresistor’s resistance is low. Measure and record the photoresistor’s resistance and the current flow through it in both ambient light and in the dark. Cover the top of ...
Exercise 1:
... 1. A photoresistor is a light sensitive resistor. When it’s dark, the photoresistor’s resistance is large; when it’s light, the photoresistor’s resistance is low. Measure and record the photoresistor’s resistance and the current flow through it in both ambient light and in the dark. Cover the top of ...
... 1. A photoresistor is a light sensitive resistor. When it’s dark, the photoresistor’s resistance is large; when it’s light, the photoresistor’s resistance is low. Measure and record the photoresistor’s resistance and the current flow through it in both ambient light and in the dark. Cover the top of ...
Resistive opto-isolator
Resistive opto-isolator (RO), also called photoresistive opto-isolator, vactrol (after a genericized trademark introduced by Vactec, Inc. in the 1960s), analog opto-isolator or lamp-coupled photocell, is an optoelectronic device consisting of a source and detector of light, which are optically coupled and electrically isolated from each other. The light source is usually a light-emitting diode (LED), a miniature incandescent lamp, or sometimes a neon lamp, whereas the detector is a semiconductor-based photoresistor made of cadmium selenide (CdSe) or cadmium sulfide (CdS). The source and detector are coupled through a transparent glue or through the air.Electrically, RO is a resistance controlled by the current flowing through the light source. In the dark state, the resistance typically exceeds a few MOhm; when illuminated, it decreases as the inverse of the light intensity. In contrast to the photodiode and phototransistor, the photoresistor can operate in both the AC and DC circuits and have a voltage of several hundred volts across it. The harmonic distortions of the output current by the RO are typically within 0.1% at voltages below 0.5 V.RO is the first and the slowest opto-isolator: its switching time exceeds 1 ms, and for the lamp-based models can reach hundreds of milliseconds. Parasitic capacitance limits the frequency range of the photoresistor by ultrasonic frequencies. Cadmium-based photoresistors exhibit a ""memory effect"": their resistance depends on the illumination history; it also drifts during the illumination and stabilizes within hours, or even weeks for high-sensitivity models. Heating induces irreversible degradation of ROs, whereas cooling to below −25 °C dramatically increases the response time. Therefore, ROs were mostly replaced in the 1970s by the faster and more stable photodiodes and photoresistors. ROs are still used in some sound equipment, guitar amplifiers and analog synthesizers owing to their good electrical isolation, low signal distortion and ease of circuit design.