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Circuits
Overachieving and under-appreciated, circuits are the foundation that our technological society is built on. Now's your chance to find out not only how they work, but why. Questions regarding the physics behind voltage, resistance, capacitance, inductance, transistors, LEDs, switches, and power supplies; and how they're used to create analog and digital circuits, should be directed here.
1,646 Questions
How many amps is 2 hp at 230 Volts 3 phase?
1 horsepower = 746 watts
2 hp = 1,492 watts
Voltage x current = power
230 x current = 1,492
Current = 1,492/230 = 6.487 Amperes (rounded)
What carries electrical signals trough our body?
Nerves do. Your brain sends electrical signals through your nerves to your muscles
to make you move. Signals from the far ends travel through nerves back to your
brain, so you can see, hear, smell, taste, and feel.
Can several people who are holding hands be electrocuted at once?
Answer #1:
Several people holding each other won't be all electrocuted..
The one to feel the electrocution effects will be the last on the line as the others
between him and the electric source will just conduct the electric current.
The current will just pass through them, they will act as conductor to the last person
on the line.
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Answer #2:
Another way to look at it: "The first answer is wrong."
The current is the same at every point in a series circuit, so everybody
in that ill-fated chain has the same current through his body.
At the point where the first answer says "The current will just pass through
them.", one wants to jump up and scream "Do you think that might possibly
carry some element of physical danger ? ! ?"
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Answer #3:
Actually, you are both wrong. The person and the start and finish of the chain will
receive larger charges than the people inside the chain. The first and last person are
feeling the base charge plus the stored charge of the people inside the chain.
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Answer #4:
Answer #3 introduces concepts apparently published on planet Nibiru and distributed
by way of the Oort cloud and several comets.
-- "Base charge" is a phrase completely unknown to any engineering discipline here on Earth.
(Unless, perhaps, you're talking about the amount already showing on the taxi meter before
you even climb in.)
-- "Stored charge" is relevant to capacitors, Leiden jars, Wimshurst and Van de Graaff machines,
and thunderclouds, but not to human bodies.
Current through the body kills. The current is identical at all points in a series circuit.
If the people are all holding hands in a chain, then they form a series circuit, the current
is the same through each person, and the probability of fatality is roughly the same for
each, regardless of his place in line.
How many watts does a 5000 BTU AC unit typically use up?
A 5000 btu AC unit operating at 25% efficiency operating continuously for 1 hour, will use approximately 5858 watts or 5.858 KW/h.
What happens to a 25W 220V bulb when connected across 440V line?
The real-world answer is that the bulb glows with dazzling brilliance for a few
seconds and then burns out.
Electrically, the technical answer is:
Assuming we're working with a traditional incandescent bulb, the filament is designed
to dissipate 25W when connected to 220V. We could easily calculate the resistance of
the filament from that information, but for this discussion, it doesn't matter. It's just 'R'.
The Power dissipated by anything is V2/R
So if the voltage across the device is doubled, the power dissipation increases by
a factor of 4 . Your incandescent bulb begins to dissipate 100w instead of 25w.
Refinement:
The resistance of any metallic conductor increases when the temperature of the
conductor rises. The temperature of the filament certainly increases when its
power dissipation increases.
So 'R' increases, and the dissipation settles at something a little less than 100
watts. But have no fear ... at 100% over-voltage, your bulb will definitely blow.
Is potential difference directly or inversely proportional to resistance?
Potential difference is directly proportional to resistance according to Ohm's Law. This means that as resistance increases, the potential difference across a component also increases, assuming the current remains constant.
Why is a doorbell containing an electromagnet called a 'make and break' circuit?
A doorbell containing an electromagnet is called a "make and break" circuit because the circuit is completed ("made") when the switch is pressed, allowing current to flow through the electromagnet and create a magnetic field that attracts the doorbell mechanism. When the switch is released, the circuit is broken, stopping the flow of current and releasing the doorbell mechanism.
How many small appliance branch circuits are required in a residence?
NEC 220.52(A) & (B) state that an additional load of not less than 1500 volt-amperes shall be included for each two-wire small appliance circuit and each laundry circuit.
Resistors in parallel work just like highway lanes in parallel.
-- The more lanes there are, the more traffic they can carry.
-- Any number of lanes in parallel are always wider than the widest single lane,
and can carry more traffic than the widest single lane can.
"wide lane" = low resistance
"narrow lane" = "high resistance"
"traffic" = "electric current"
Do amps increase when electricity is ran through steel?
Yes - very much so. Steel is an excellent conductor of electricity. Wood on the other hand is a very poor conductor.
What Precaution Should Be Taken While Measuring Resistance with the help of multimeter?
you should take care to ensure that the circuit components being analysed are isolated from the power supply.
only carry these test out if you are completely confidnet that your safety is guarranteed from a possable electric shock.
you should also take care to ensure that the electrical contact restistance
across your fingers and hand do not give a false reading
where they would allow a leakage of small electrical current thruogh your fingers
if you choose to hold your measuring probes of the meter onto the restance - component with your fingers directly.
although this isnt reccomended .
you should use approved equipment designed to connect to any terminals or components safely ; crocdile clips .
When a network has 10 nodes and 17 branches an all then the number of nodes pair voltages would be?
49
How close can a washing machine be to an electric circuit box?
dont try to run one on a 100 ft cord . check the voltage. it must be with in 10 % of the rating of the machine
Why is a car headlight parallel?
If they were wired in series, losing one bulb would leave you with no headlights at all, and that would be dangerous.
What component of fitness does lunges help improve?
Although it's been soundly debunked since the 1980s, the idea that you can target a specific body part for fat loss is an enduring fitness myth. Fat comes off your body as a whole, which can be frustrating if you've set goals to shed fat from just one area. On the other hand, this means all exercises contribute to losing weight from your target areas. Lunges, for example, contribute to losing belly fat even though they work out your legs.
Can diode work on ac power supply?
diodes conduct electricity in only one direction but as ac change direction in each of its cycle diodes can only conduct half of its cycle which will give u a pulsating dc. but if dc is mixed with ac and if it can put whole of its cycle in positive direction diode can conduct ac. so diodes are usually used to produce dc from ac.
Can rusty crocodile clips affect a circuit?
Yes. If they sometimes make contact and sometimes don't, they behave just like
ON/OFF switches. And if they make contact but rob some of the energy of the
current that flows through them, then they behave just like resistors.
When a fuse wire melts the electrical energy is transfered as what 2 types of energy?
When a fuse wire melts, the electrical energy is transferred as heat energy and light energy.
What precautions should be taken before electroplating?
Check if the element that is be use to electroplate is not corrossive.
What is the efficiency of a transmission line?
Transmission line efficiency is power at the recieving-end of the line compared to the power at the sending-end of the line and is expressed as a percentage, so this can be formulated.
% efficiency = load power (output) / source power (input) x 100
In the line, there are power losses. to calculate this we use the formula:
power loss = 3.I2.R where I is current and R is resistance.
Now that we have the losses, we know the difference between the input and the output. So, for example, if one had the output value known, then to get the input we just add the loss to the output or if had the input known, just subtract the loss from it to get the output.
hope that helps
it is the coiled wire that heats up and gives off light in a incandescent (ordinary) light bulb.
What size conductors are to be used small appliance branch circuits?
All small appliance branch circuits, typically kitchen, are required to be 12awg. Cu., or 20 amp.
