Tagged Questions

1
vote
2answers
135 views

How many watts will the resistor in this naîve PSU dissipate?

One would be inclined to think the average current on resistor R would be exactly the same as in the load L, but I'm not so sure of that fact, due to the effect of the (big, 1000uF+) capacitors. ...
0
votes
0answers
109 views

skin and proximity effect for solid cables

I am just wondering how to compute the skin and proximity effect for solid cables. The ks and kp values in the table here: Table are 'just' for stranded cables etc. Thanks.
1
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3answers
225 views

what is the magnitude of total voltage in the below circuit?

I was working on some RLC circuits and I found a question something like this. In series RL circuit, \$V_R\$ = 4V and \$V_L\$ = 3V. what is the magnitude of total voltage ? I just thought \$V_T\$ = ...
1
vote
1answer
379 views

Electric circuit AC plug to DC Design Help

I'm new to designing electric circuits... but I have a simple project that I really need help on. All I need is a AC plug source to be connected to a 100 WATT bulb and a 3V motor(motor should only ...
3
votes
1answer
455 views

Zero Cross Detection Circuit for line voltage [duplicate]

Possible Duplicate: How can I detect a power outage with a microcontroller? I'm doing some research with the goal of eventually creating a light dimmer controllable from a micro controller. ...
0
votes
1answer
3k views

How to slow down a 220V fan? [duplicate]

Possible Duplicates: what do I need to make 230V AC fan spin slower? 220v AC Fan regulator I have an old fan with a relay made for 4 different speeds. Currently, they are all shorted ...