There is insufficient information in the question to properly answer it.
You need to specify if the resistors were in series or parallel.
Also, it is incorrect to say "current ... across" - it must be "current ... through".
Assuming that you mean a series circuit then it can be solved:
R(total) = Sum of the resistors in series
R(tot) = 3 x 4 Ohm
= 12 Ohm
Ohm's Law:
V = IR
V = 42 x 12
= 504 Volts
(Note: Because Ohm, Volt and Ampere were named after scientists they are always given capital letters. Ohm not ohm)
What direction does a Chevy motor rotate?
Chevy's rotate clockwise but to confirm, remove the distributer cap and have someone turn it over. Hope This Helps. Oilman is correct, it rotates clockwise. I have added a link to the left below that you may find useful. It contains all sorts of specifications for your rare big block 409. Hang on to this engine, as it is extremely rare if it is authentic.
Poor tip preparation, and poor alignment of electrodes, excessive current and hold time will all contribute to burrs,
What instrument is used to vary electrical resistance in a device?
Virtually all electrical devices (actually, all except for superconducting devices) have resistance. There is one type of electrical device that is found in almost every electronic circuit ever invented. It is used wherever the designer needs a specific amount of resistance in the circuit. I'd hate to spoil your fun by simply telling you its name. Think of all of the different names of electrical devices that your teacher has told you about. (or look in the index of your text book if you're in a hurry) Is there one that comes to mind when you think of RESISTance?
How is a voltmeter wired in with the load?
An inline volt meter is designed to have the voltage pass through it. The wire has to be cut or otherwise disconnected, and the meter installed between the disconnected ends of the wiring.
Once a day you feel an electric shock go across your chest what is that?
This could be a sign of stress or something more serious. If this persists, it would be wise to see your doctor.
Can you use 220 Volt 3 Phase as 208 Volt 3 Phase?
Yes by using a 3-phase transformer. The size depends on how much power has to be converted.
What is the difference of a Circuit Breaker from an Air Circuit breaker?
They are completely different. A moulded-case circuit breaker is a low- or medium-voltage device, whereas an air circuit breaker is a very large circuit breaker designed for use in high-voltage transmission/distribution substations.
How find out voltage of power line?
You can ask your local utility. They may or may not tell you, depending on how high of voltage you're talking about, and whether sharing this information opening is deemed a security risk (even though you might be able to walk around and see them).
The electrical resistance of circuit is influenced by three primary factors?
Resistance is directly proportional to the resistivityand length of a material, and inversely-proportional to its cross-sectional area. It should also be noted that its resistivity is affected by temperature, so temperature indirectly affects resistance.
Which is better inverting or non inverting of signal processing?
Hi,
Neither is better than the other. The reason for inverting a signal depends on the next device in the chain or for a specific phasing need in the design.
Maybe you need something to operate opposite of the incoming signal, for instance, when a voltage goes positive, you need it to go negative (or opposite), inverting would be used.
Of course, you can have the option of having both inverting and non-inverting operations at the same time, and can have multiple circuits performing that function.
Form follows function and a designer will do what ever's necessary to make the circuit operate as need requires.
Hope this helps,
Cubby
What is the difference between a phosphorescent source and a fluorescent source?
phosphorescent is glowing in the dark;reusing old light it has stored, like a glow in the dark keychain fluorescent is something that glows when energy is applied to it, such as the fluorescent lightbulb As the name implies, phosphorescent comes from the element phosphorus. Many other substances which are not phosphorus can fluoresce at certain wavelengths of light. I agree phosphorous like sea waves sometomes.
Why trasformer is static device?
b'coz transformer is not a moving parts so it works on the princeple of mutual induction
What are the advantages of series and parallel circuits and series - parallel circuits?
An advantage to parallel circuits is that if one component fails the circuit is not broken, therefore allowing the rest of the components to receive electricity. A good example of this is a string of Christmas lights which are wired in parallel so that if one bulb blows the entire circuit is not broken.
How does changing resistance affect voltage and current?
current change with resistance as, anything which opposes flow of current is called resistor is circuit, now we use battery to give potential across the circuit, potential just ensure the continuous flow of charge from higher to lower potential (water flows from high PE to low PE), while resistance opposes the flow of charge and thereby effecting the value of current, it's practically found that more is the resistance, less is the current flowing through resistance, this is indirectly observed from ohm law V=IR.
Why 30 to 40 volts of DC Is dangerous to us?
Volts alone is not dangerous, but volts does causes amps. Amps can be dangerous to you if it flows through your body. That's because your brain, your nerves, and your muscles ... including your heart ... all operate on tiny natural volts and amps. They can all go haywire when big ones get in from outside your body.
NASCAR uses many different engines. but in the sprint cup series. ALL SPRINT CUP CARS use carbourated Chevrolet 350 4-bolt main small block V-8s, bored out to 358. which is 5.7L. approx 800 horsepower.
Why are most homes wired in a parallel circuit rathen than a series circuit?
Series circuits , the voltage is drawn by instruments progressively from source to end whereas parallel circuits give a constant voltage through all the points connected parallel to the source hence the name.In series circuit,the more the power drawn by an instrument,the lesser the voltage available for the next instrument connected after it serially from the source. Hope this solves the question
Can a person die from the voltage of a nine volt battery?
No. The amperage isn't high enough for you to be harmed by it.
No, across the tongue it can't kill you. If someone opened up your chest and put the battery across your heart then you might be in trouble...
Possible. If you have a heart condition, pace maker, etc. then there could be problems any electrical voltage no matter how minor. Also, if the battery touches a nerve close to the surface of your tongue, it can cause other issues.
On top of that, not all batteries are made to specs, just ask Sony. With manufactures farming out to other vendors, they loose track of quality control. A battery that is not to spec will provide the jolt to seriously injure someone.
Why humming sound occur in extra high tension transmission lines?
The noise is better described as 'buzzing', rather than 'humming', and it is caused by the breakdown of the air's insulating properties, due to stress caused by electric fields set up in the vicinity of where the conductors are supported from insulators. The noise is accompanied by a pale blue discharge which becomes visible after dark.
Is that possible to transfer current through laser?
Yes. According to Einstein's 1911 paper, a light passing near a large mass will bend towards the mass. And it can also be refracted by materials of differing indexes.
When you add another light bulb to a circuit does it effect the voltage?
When a bulb is added in parallel to a circuit with a single bulb, the resistance of the circuit decreases.
This is because the existing bulb's operating point remains the same, due to the fact that Kirchoff's voltage law states that the signed voltages around a series circuit must add up to zero, with the two bulbs being their own series circuit. A consequence of this is that the voltage across both bulbs must be the same, i.e. that the voltage across the first bulb does not change.
The second result of adding the bulb is that the current in the overall circuit increases.
This is because the second bulb must pull some current in order to operate, yet we know that the voltage across the first bulb did not change. As a result, due to Ohm's law, the current through the first bulb did not change. And, finally, since Kirchoff's current law states that the signed sum of the currents entering a node is zero, the addition of a second load in parallel with the first load must, therefore, represent additional current.
What is a ring main circuit in the UK and the Irish Republic?
A ring main circuit for example is:
key:
circuit breaker=0
cable=----
socket=[]
bends in cable=/ and \
Using the key this is a demonatration.
0---[]-----[]-------[]------[]---[]---\
\---[]-----[]-----[]----[]-------[]---/
Just imagine that there is only 1 circuit breaker in that circuit, both ends of the ring main should link up to that 1 breaker.
A radial circuit consists of just 1 cable going to the circuit breaker with sockets on the cable but there is no return path on a radial.
A ring main is just like a big circle with 2 ends of cable and sockets around the circle=both ends of the cable linking to the circuit breaker.