I. Electric Charge - Otterville R
... current travels in multiple paths • one break doesn’t stop flow current varies in different branches • takes path of least resistance • “bigger” light would be dimmer each device receives the total voltage • no change when lights are added ...
... current travels in multiple paths • one break doesn’t stop flow current varies in different branches • takes path of least resistance • “bigger” light would be dimmer each device receives the total voltage • no change when lights are added ...
Circuit Breaker Types.ppt
... current is multiplied by a factor of 1.6 to determine the rms value of the current the circuit breaker must withstand. This current is called the momentary current . The interrupting current of a circuit breaker is lower than the momentary current and will depend upon the speed of the circuit breake ...
... current is multiplied by a factor of 1.6 to determine the rms value of the current the circuit breaker must withstand. This current is called the momentary current . The interrupting current of a circuit breaker is lower than the momentary current and will depend upon the speed of the circuit breake ...
ECE Final presentation
... • Materials for DC: breadboard, resistors, a diode, a DC Power Supply, and a multimeter. • The breadboard was the main component of the circuit. • Resistors and diodes were used to build parallel and series circuits. • Once the circuit was built we hooked up a DC Power Supply to the bread board usin ...
... • Materials for DC: breadboard, resistors, a diode, a DC Power Supply, and a multimeter. • The breadboard was the main component of the circuit. • Resistors and diodes were used to build parallel and series circuits. • Once the circuit was built we hooked up a DC Power Supply to the bread board usin ...
Chapter 14: Amplifiers & Oscillators
... • We often use simple wire to connect circuits, however, sometimes it is necessary to isolate AC circuits from DC influences • It is possible to provide coupling of AC signals ...
... • We often use simple wire to connect circuits, however, sometimes it is necessary to isolate AC circuits from DC influences • It is possible to provide coupling of AC signals ...
The solution to Homework Assignment #0
... 1) Give a Boolean expression for the detection of overflow in addition of two binary numbers in terms of specific bits of the numbers. The numbers are each 8 bits with one bit being the sign bit, in 2's complement form ...
... 1) Give a Boolean expression for the detection of overflow in addition of two binary numbers in terms of specific bits of the numbers. The numbers are each 8 bits with one bit being the sign bit, in 2's complement form ...
2A. Two similar inductive coils with negligible resistance are wound
... 5B. A 30KVA, 2400/120 V, 50Hz transformer has high voltage winding resistance of 4.5 Ω and leakage reactance of 10 Ω. The corresponding values on low voltage winding are 0.01 Ω and 0.025 Ω. The iron losses are 1.5 KW. Calculate (a) equivalent impedance referred to high voltage ...
... 5B. A 30KVA, 2400/120 V, 50Hz transformer has high voltage winding resistance of 4.5 Ω and leakage reactance of 10 Ω. The corresponding values on low voltage winding are 0.01 Ω and 0.025 Ω. The iron losses are 1.5 KW. Calculate (a) equivalent impedance referred to high voltage ...
2005-2 Second Exercise: The circuit breaker in a kitchen ( 6.5 points
... An incandescent lamp carrying the following indications (220 V, 100 W). 1) These electrical appliances are connected in parallel. Why? 2) a) The lamp functions normally. Why? b) Calculate the effective electric current I1 through the lamp. 3) a) The effective voltage across the water heater is 220 ...
... An incandescent lamp carrying the following indications (220 V, 100 W). 1) These electrical appliances are connected in parallel. Why? 2) a) The lamp functions normally. Why? b) Calculate the effective electric current I1 through the lamp. 3) a) The effective voltage across the water heater is 220 ...
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.