power-on power-off time of the LED is not an issue. In general, FET switches are the fastest of the switches discussed here. Also, because there are no mechanical parts or LEDs in the packaging, FET switches can be very small. One major drawback of the FET switch, however, is that ...
An uninterruptible power supply is something you might not think about until you really need it. MF3d / Getty Images It's a foundational element of device integrity, but you wouldn't be the first person to beg the question, "What is a UPS?" In short, a UPS safeguards electronic device...
Because reed relays are so susceptible to contact damage, inrush currents from system capacitance can be particularly dangerous. Inrush currents can be controlled with a series impedance, such as a resistor or ferrite, between the relay and the capacitance. Any capacitance in the system can contri...
Today, the cost to provide accurate time, directly traceable to national standards, is quite reasonable. It is practical to provide an accurate clock right at the customer premises, connected directly to (or part of) the revenue meter. Power Quality Incentives Utilities and system operators are n...
When the voltage is at a certain level, the makeup of the gas is such that it is a poor conductor. When the voltage surges above that level, the electrical power is strong enough toionize the gas, making it a very effective conductor. It passes on current to the ground line until the...
For large power resistors, the resistor body is big enough to print the resistance value, tolerance, and wattage rating on them. But for small rating resistors say 0.25 W resistors are very small in size and it’s difficult to print its value directly onto the component surface. Hence a st...
The circuit uses an LDR (Light Dependent Resistor) as a light sensor, which, in simple terms, is a resistor whose value increases in darkness and decreases in the presence of light. Then it uses one transistor to detect the light, and another to drive the relay. ...
When the voltage is at a certain level, the makeup of the gas is such that it is a poor conductor. When the voltage surges above that level, the electrical power is strong enough toionize the gas, making it a very effective conductor. It passes on current to the ground line until the...
Thus, we get voltage equals the power divided by current. Mathematically, Example 2 As shown in the below circuit a current of 2 A is flowing through a lamp of 48 W. Determine the supply voltage. Solution: Given Data: , According to the formula between voltage, power, and current mention...
To be precise the emitter voltage will be just 0.7 V behind the base voltage. For example, if the base voltage is 6 V, the emitter will 6 - 0.7 = 5.3 V and so on. The 0.7 V difference is due to the minimum forward voltage drop rating of the transistor across the base emitter. ...