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Why does voltage matter?
Voltage is a measure of electrical potential. I understood voltage best when my first semester Electronics professor told the class that voltage is to an electrical circuit as water pressure is to a plumbing "circuit".
What is meant by the internal resistance of a battery?
There is internal resistance in a battery because a battery is not an ideal voltage source. It may be close, but it is not ideal. As a result, analytically, there will be some series resistance, resistance which places a limit on the maximum current that the battery can provide. While no battery is ideal, most are sufficiently ideal to not require any consideration of the internal resistance. If your circuit is dependent on the internal resistance of a battery, then it is probably not well suited for that application.
What will happen to voltage divider circuit if emitter resistance is greater than collector resistance?
The gain of a class A, common emitter BJT amplifier, a fairly standard configuration, is defined as collector resistance divided by emitter resistance, or as hFe, whichever is less. Assuming that we are operating in a linear mode, and hFe is not a limiting factor, then the emitter resistance being greater than the collector resistance simply means that the gain is less than one.
Why in common collector amplifier however you change value of resistance not amplifier in voltage?
The question does not quite make sense. It sounds like you are asking why does changing the emitter resistor in a class C common collector amplifier not affect the output voltage? If so, the answer is that the common collector is an emitter follower, meaning that the emitter will follow the base, less the base-emitter junction voltage, within the limits of hFe. The resistor is simply there to ensure output biasing when the base voltage goes low.
In what class lever is the resistance arm always longer than the force arm?
The class 3 lever always has a longer resistance arm than the force arm. This is because the distance from the Fulcrum to the load/resistance is always going to be further that the fulcrum to where the effort/force is applied. If you look at a diagram of a 3rd class lever, you will be able to see why this is.
Why does voltage matter?
Voltage is a measure of electrical potential. I understood voltage best when my first semester Electronics professor told the class that voltage is to an electrical circuit as water pressure is to a plumbing "circuit".
How is Amperage Draw determined in electrical devices?
Ohm's law revisited; Current (amperage) = voltage divided by resistance. E=I/R http://www.glenbrook.k12.il.us/gbssci/Phys/Class/circuits/u9l3c.html http://www.bcae1.com/ohmslaw.htm
Why class AB amplifier have high efficiency?
A class AB amplifier of the complementary transistor type has two transistors in series. Both transistors can change the resistance. If the upper transistor, a npn type, has minimum resistance and the lower transistor, a pnp type, has maximum resistance, the output voltage is near the supply voltage. One transistor is totally open and has zero current, the other transistor is totally closed and has zero voltage. Working together both transistors can set the output to any voltage between 0 and supply voltage. The class AB efficiency maximum is 100% minus the bias-power, see for example D. M. Snider, "A Theoretical Analysis and Experimental Confirmation of the Optimally Loaded and Overdriven RF Power Amplifier", 1966. Today the overdriven class AB amps are called class D.
When applying a test voltage to a class 1 equipment a value of 01oms is measuerd why is this?
if you are using an ohmmeter you are measuring dc resistance you need to use ac current to test ac resistance (Impedance) if an ac device has a transformer the dc resistance is very likely under 1 ohm nec class 1 up to 600v nec class 2 below 60V
What is an electrical resistor?
When an electric current moves through a conductor, there is always some electrical resistance to the current. This is because of the attraction of the electrons to the positive nuclei of the atoms in the conductor. This attraction is greater in some conductors than in others, giving them a greater electrical resistance.As the electrons are pushed through a conductor they lose some of their energy as heat. This waste heat can be a nuisance; for example, computers get hot when used. However the waste heat is sometimes useful. For example, because nichrome wire has a fairly high resistance, it is used to make the heating elements in many electrical appliances used around the home. It is usually coiled to take up less space. The filament of a light bulb is made of very thin tungsten wire. When a current is passed through it, the wire becomes so hot that it gives off a brilliant white light.Hope that answers your question!!Thanks for reading :)Thanks GeorgeElectrical resistance exacts a voltage drop as the price for allowing electrical current to flow through the resistance. The use of the term resistance implies that the current flow will be in phase with the voltage across the resistor and that the current flow will be proportional to the voltage drop. These conditions are Ohm's Law. There are devices which do not meet these conditions. They can be useful, but they should be considered as another component class such as thermistors etc. Mathematically V = I x R, where V is the instantaneous voltage across the resistance, I is the instantaneous current through the resistance, and R is a constant specific for the resistance. If V is in Volts and I is in Amperes, then R will be in Ohms. Practical resistors vary modestly with temperature, but change very little with voltage or current, except as these change the temperature. A resistor should be the same for flow in either direction and for DC and AC of modest frequency. At high frequencies resistors can display inductance and/or capacitance.Resistors can be purchased with various resistance tolerances, with various temperature sensitivities, and with various power ratings. Running at full power rating may shorten life and may produce temperatures which affect adjacent components. Derating to 1/2 or even 1/3 power may be wise.It is a measurement of how hard electricity flows thru specific area. In SI is measured in ohm.Resistance is the opposition to the flow of electric current, and is measured in ohms. Resistance is directly proportional to the length of a conductor and inversely proportional to its cross-sectional area, and directly proportional to the resistivity of the material from which the conductor is manufactured. As resistivity is affected by temperature, resistance is indirectly affected by temperature.An example of an electrical resistance is a bar-type radiant heater. The resistance in the windings (these are usually of small diameter wire) causes the electrons to flow slower, causing heat which manifests itself as the hot glow you see and the warmth you feel.
Why is class c is for putting out electrical fires?
An electrical fire is a class "C" fire. A Class "C" fire is actually a class "A" or "B" fire that is caused by electrical current.
What is meant by the internal resistance of a battery?
There is internal resistance in a battery because a battery is not an ideal voltage source. It may be close, but it is not ideal. As a result, analytically, there will be some series resistance, resistance which places a limit on the maximum current that the battery can provide. While no battery is ideal, most are sufficiently ideal to not require any consideration of the internal resistance. If your circuit is dependent on the internal resistance of a battery, then it is probably not well suited for that application.
What is the classification of an electrical fire?
An electrical fire is a class 'C' fire. In addition, Class 'A' is combustibles that leave an ash. (Paper, etc.) Class 'B' is flammable liquids. Class 'C' is electrical. Class 'D' is a metal fire.
What will happen to voltage divider circuit if emitter resistance is greater than collector resistance?
The gain of a class A, common emitter BJT amplifier, a fairly standard configuration, is defined as collector resistance divided by emitter resistance, or as hFe, whichever is less. Assuming that we are operating in a linear mode, and hFe is not a limiting factor, then the emitter resistance being greater than the collector resistance simply means that the gain is less than one.
Class c fire extinguisher is used for?
A class C fire is an electrical fire. A class C extinguisher is approved for electrical fires.
In what class of a lever is the effort between the fulcrum and the resistance?
Class 3.
How do I get a c-class electrical license?
You can get your c-class license through your employer, or your local electrical alliance association.
