Electrical Engineering
Phil Frost's user avatar
Phil Frost's user avatar
Phil Frost's user avatar
Phil Frost
  • Member for 10 years, 11 months
  • Last seen more than 2 years ago
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706 Answers

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256 votes
Accepted

How can I efficiently drive an LED?

82 votes
Accepted

Does mAh measure how long a battery would last?

80 votes
Accepted

How can I implement regenerative braking of a DC motor?

80 votes
Accepted

MOSFET: Why the drain and source are different?

73 votes
Accepted

My understanding of RC circuits is broken

72 votes
Accepted

How does a capacitor smooth energy?

61 votes
Accepted

Does turning a lighbulb on and off repeatedly use more energy than just leaving it on for hours?

56 votes
Accepted

What is input and output impedance of an opamp?

55 votes

What is ground and what does it do?

44 votes
Accepted

Difference between Brushless Motor and Stepper Motor

41 votes
Accepted

Is Ohm's Law violating itself?

40 votes

Why do we need an isolation transformer to connect an oscilloscope?

40 votes

How can PCB trace have 50 ohm impedance regardless of length and signal frequency?

38 votes
Accepted

Why should I worry about a motor causing my supply voltage to shoot up when the back-EMF can't exceed the supply voltage?

37 votes
Accepted

What makes a pull-up/down resistor strong or weak?

35 votes
Accepted

How does an antenna radiate (how do currents flow through the wire)

33 votes
Accepted

ESR and parallel capacitors

32 votes
Accepted

Why do LEDs have a maximum current?

32 votes
Accepted

Burned out filament but the light bulb has small resistance

31 votes
Accepted

Does a capacitor store charge?

31 votes
Accepted

Why can I put an electrolytic capacitor on AC?

29 votes
Accepted

Help me understand the relationship between positive, negative, neutral and ground in AC and DC

29 votes

Do electrons actually flow when a voltage is applied?

28 votes

How to get high current from 9 volt batteries

28 votes
Accepted

Why is it bad to mix new and old batteries?

27 votes
Accepted

How can I measure back-EMF to infer the speed of a DC motor?

26 votes
Accepted

What is "offset null" in IC 741?

26 votes
Accepted

What is killing my MOSFETs?

26 votes
Accepted

How fast does electricity flow?

26 votes

Use of global variables in Embedded Systems

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