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When is the current flowing in a circuit said to be very small?
Wiki User
∙ 13y ago
When the current flowing in a circuit is very small the resistance will be very high.
Wiki User
∙ 13y ago
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What is a safety device that break a circuit when too much current is flowing called?
Circuit breakers are designed to automatically and manually interrupt circuits. When circuit breakers automatically actuate they are said to have 'tripped.' Also user operators can shut down circuits through individual breakers or the entire system through a master breaker.
What pushes current through a circuit?
Voltage pushes current through a circuit. A good example of how this works would be water pressure and flow. your faucets at home as long as they are closed have water pressure on them but no flow. You open a faucett and the water starts flowing pushed by the pressure. The voltage is represented by the water pressure and the Current (amps) is represented by the water flow.
Why capacitor is said to be a reactive component?
In electrical or electronic circuits, impedance can be said to have capacitive or inductive components. Capacitors cause capacitive impedance, and coils (chokes, transformers, loudspeakers, etc.) cause inductive impedance. A capacitor is said to be a reactive component in an AC circuit because it holds charge, then releases it, causing a phase shift in the output current. This phase shift in current equates to a phase shift between current and voltage. Reactive power is defined as a phase shift between current and voltage.
Why current flow in the opposite direction of flowing electron?
Electrons do not flow, but they might be though of as 'flowing' as they transfer charges between them. The reason that electron flow is the opposite direction from current is that historical theories of electrical flow (current) treated it as a movement of positive charges rather than negative charges.There is no actual difference that could be discerned, except that we now know that negative charges (electrons) constitute the basis of most common electricity.
What is the relationship between current voltage and resistance?
The first, and perhaps most important, relationship between current, voltage, and resistance is called Ohm's Law, discovered by Georg Simon Ohm and published in his 1827 paper, The Galvanic Circuit Investigated Mathematically. Ohm's principal discovery was that the amount of electric current through a metal conductor in a circuit is directly proportional to the voltage impressed across it, for any given temperature. Ohm expressed his discovery in the form of a simple equation, describing how voltage, current, and resistance interrelate:E = IRIn this algebraic expression, voltage (E) is equal to current (I) multiplied by resistance (R). Using algebra techniques, we can manipulate this equation into two variations, solving for I and for R, respectively: I = E/R and R = E/I.answer discovered that relation only after VOLTA establish the voltage relationship and AMPERE discovered the current relationship. and of course WATTS establish the power.521R=VResistanceOHMSoli
When the circuit is said to be in resonance?
For a particular frequency if the current or the voltage of the circuit is Maximum or Minimum then that circuit is said to be in resonance .
Difference in parallel and series circuits?
If two or more circuit components are connected end to end like a daisy chain, it is said they are connected in series. A series circuit is a single path for electric current through all of its components. Bulbs will get dimmer the further along the chain. If two or more circuit components are connected like the rungs of a ladder it is said they are connected in parallel. A parallel circuit is a different path for current through each of its components. A parallel circuit provides the same voltage across all its components and hence the same brightness of bulb.The voltage is the same in a parallel circuit while the voltage is shared in a series circuit.
What is a parralell curcuit?
• In a parallel circuit, there are junctions in the circuit so the current can flow around the circuit in more than one way. • In a series circuit the current decreases as more bulbs are added. •In a parallel circuit, as more bulbs are added, the current increases. • This is because bulbs added in parallel offer less resistance
What is a circuit with two or more branches for current to flow called?
Parallel circuit
How does circuit stop flowing when light bulb switch is off?
The simplist answers is that electricity needs to complete a circuit fully. It stops flowing because there is no complete circuit. The switch is a device for opening and closing the circuit. When the switch is in the off position the circuit is said to be open and electricity cannot flow.
Which is the dangerous current?
You can't really separate them. It's the current flowing through your body that does the damage, but the value of the current depends on the voltage across your body -the higher the voltage, the higher the resulting current.
What does the resistance in an electrical circuit limit?
Current flow. It's also worthy of noting that a resistor doesn't limit-by, it limits-to, and the current is dependent on the voltage. I[A] = U[V] / R[ohm] It's also worth to note, that the power flowing through said resistor with resistance R is I[A] * U[V] for DC circuits - helps to remember this well when picking appropriately-rated resistors for replacement. Example: let's say we have a 20-ohm, 2W resistor. If we place it in a circuit with 5V, we will get 5V / 20ohm = 250mA (0.25A) of current flowing through the resistor. The power the resistor will "see" is 250mA * 5V = 1.25W, so it's safe. But let's now put that same resistor in a 12V circuit. The current flowing will be 12V / 20ohm = 600mA (0.6A), and the power will be 600mA * 12V = 7.2W, so the resistor will burn.
Current is equal to the voltage difference of a circuit divded by its resistance?
Similarly the OHM is said to be the HOME of the volt.
What is the difference between DC and AC?
The primary difference between DC and AC is the direction of current flow. In a DC circuit, all electron current flow is in one direction. In an AC circuit, current flows in one direction for part of the time, and in another direction for another part of the time. In the AC circuit, we'll see current flowing "back and forth" instead of the unidirectional current flow we find in a DC circuit.DC is "Direct Current", and AC is "Alternating Current". In DC, the current flow is in one direction only. In AC, the current flow is constantly changing direction.An example of DC is the output of a battery. An example of AC is the power present in a home electrical system.The current whose magnitude and direction remains change called as alternating current.The current whose magnitude and direction remain unchanged called as d.c. Current.
How does current exist wen voltage is zero in short circuit?
According to Ohm's Law, V = I*R, where V = voltage (volts), I = current (amps), and R = resistance (ohms). Mathematically speaking, when you have a short circuit, resistance is said to be zero, as well as voltage is equal to zero, therefore zero divided by zero is infinity. In a few words, you can't have infinite current but that means current exists in a fairly large quantity in a short circuit which is why equipment burns out with short circuit.
Why current in series combination is constant?
Normally, but if the circuit has capacitors this is not necessarily true.Another viewpoint:No. The current doesn't have to be constant in a series circuit, It can grow, shrink,wax, wane, switch on, switch off, or wander randomly about. But whatever it is,it must be the same at all points in the series circuit.
If current increases then reactance will?
The reactance of any circuit element depends on the frequency of the alternating current flowing through it, unlike resistance which - except for certain components used at very high radio frequencies where the "skin effect" becomes important - is generally unaffected by the frequency.So, for most practical electrical engineering applications, resistance is considered to be independent of the current flowing through it, but that cannot be said about all kinds of reactance because some types of components - inductors, for example - can get "saturated" if the current gets high enough."Saturation" means that there is no further practical increase in an inductor's reactance after a certain level of reactance has been reached. Once saturation sets in, the reactance does not reduce, it just stays the same even though the current is made to increase.Saturation happens because a magnetic circuit exhibits "hysteresis", but that is a further topic which someone else may like to explain...
