Questions tagged [power]
Electric power is the rate at which electrical energy is transferred by an electric circuit. The SI unit of power is the watt (one joule per second). Use this tag where power is a primary concern for the design under discussion. Use the "low-power" tag when that applies.
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Turning a lamp off and on at each press of a momentary push-button switch connected to ground
I have an electric scooter with a throttle that has a momentary power switch (normally open). The throttle hall sensor has three wires +5V, GND and signal. There is one additional wire for the power ...
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How can I get Current and Voltage from PV cell?
The PV cell can be modelled with a current source, a diode and 2 resistors.
The following is the equation for single-diode model for a PV cell.
Except I and V, every variables are constants like Iph = ...
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Can a stone resistor with low values withstand 240 A pulsed current (1 Hz, 200 μs, 24 V)?
Pretty much as in the caption. I'm building a high pulse current system for a PHD project, using the capacitor bank discharge method to get the current I want. The main problem right now is a resistor ...
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Powering an opamp with a reference voltage from a zener diode
I'm making a PSU so I need to create a Vdd for the DC-DC switcher I am using that will power the switcher whilst the auxiliary supply is offline.
I decided to use an opamp comparator to drive a P-...
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Why can't we say capacitive load deliver leading var?
A capacitive load absorbs leading reactive power, whereas a capacitor used for power-factor correction acts as a reactive source and delivers leading reactive power. In an over-excited synchronous ...
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Li-ion charging + rails on small PCB (TP5100, XL4015, 2S BMS) — safest path without PCB rework?
I’m working on a piece of portable audio electronics and I’m running into some charging and power supply issues.
Project:
• Small 3-board build: power, signal (5 V), amp (needs ~9 V).
• Battery: 2 ...
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Is the Current Leading or Lagging?
I have an unconventional circuit and cannot determine if the current is leading or lagging. This makes a profound difference in the power factor calculation and so I'm asking if anyone can identify.
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Op-amp's common mode voltage in differential and isolated input signals
In the circuit below, a switching signal (10 kHz) from V1, which has a differential voltage of 3.3 V, is isolated and fed into an op-amp configured as a differential amplifier.
My question is: will ...
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Bode Plot Analysis - Determine parameters
I'm designing a digital boost converter and need help analyzing this Bode plot. Could you please help me determine the following parameters:
Crossover Frequency
Phase Margin
Gain Margin
My conclusions ...
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How to rewire several buttons to get power from a single source? [closed]
I want to buy about 20 recordable buttons. Each button requires two AAA batteries. Instead of buying 40 batteries, I would like to somehow rewire the buttons, such that all of them can be powered by a ...
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28 VDC 1.5A, 0.5A when fully charged, how can create a low current cutoff relay?
I have a 28VDC power supply charging 2 separate devices. Where the supply is turned on manually. Once activated, the 2 devices will start pulling 1.5A EACH. The current slowly drops until it is ...
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Choosing Bootstrap MOSFETs for SRM Motor Drive Circuit
I am designing a motor controller for a switched reluctance motor (SRM).
I found an application note (AN) that discussed how to create a bootstrap circuit when the circuit is in a dual forward ...
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This is a single phase SCR controlled Reactor. Simulation load is RL instead of fan motor
My problem is that I can't adjust the angle. When I adjust the angle, signal at output aurduino move but output at RL (fan motor) doesn't move as adjusted.
I don't know how to fix it.
green is output ...
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How many amps will this battery put out?
I want to connect a second battery to my E bike.
The batteries have a switch to turn them on or off, so I would only be using one battery at a time.
The label on the battery says:
Capacity 10.5 Ah
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DAC output power calculation
I’m looking to use the high speed DAC DAC linked here, but am confused about what the expected output power when measuring in a 100 ohm load. So I see on page 14 the datasheet gives a power of 1.4 dbm ...
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