Web13 feb. 2024 · Practice using Ohm's law and determining th energy dissipated by a resistor using the sample problem below. Sample Problem An electric heater draws 25-A of … Web11 jan. 2024 · To calculate the base resistor, subtract the B-E 0.7V from the driver voltage and divide by the base current: 4.5-0.7 = 3.8V / 400uA = ~9.5K ohms max. The difference in CE drop between a factor of ten and using the beta is neglible for relatively slow on/off circuits, and it lowers the driver current requirement.
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Web29 dec. 2024 · (d) Using Ohm’s law (V2=I2R2), the power dissipated by the resistor can also be found using P2=I22R2=V22R2. To find the equivalent resistance of the circuit, … Web4 apr. 2024 · To calculate the resistor value, you have to check the maximum current and voltage drop on the LED from its datasheet. For example, the standard 5mm red LED has a maximum current of 20mA and a voltage drop of around 1.7 to 2 volts. It means the LED will work properly if we pass around 15mA current through it. is fox tv on hulu
Resistor calculator - compute the best resistors combination to …
Web19 aug. 2012 · Resistor = (Battery Voltage – LED voltage) / desired LED current. So assuming a 12-volt power source and a white LED with the desired current of 10 mA; … Web5 dec. 2024 · The third digit which is the last digit is the multiplier, i.e the first two values are multiply by the third digits. The last digit which is the multiplier is in the power of ten. i.e … Web5 jun. 2024 · How To Use Resistors in a Project : Read more One important thing is to "Know thy wattage" Resistors are rated in 1/8th, 1/4, 1/2, 1W+ varieties. If you pick the … is fox tv down