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Why can you ignore the resistances of wires in circuits with lower current?
Wiki User
∙ 12y ago
Actually, it depends on the resistance of the other components in the circuit, and not so much on whether or not the total circuit current is low or not. Often, conductor resistance is ignored because it is so much lower than the active components that it does not matter. In a circuit with low resistance components, however, conductor resistance can be important, even if the total current is relatively low, because the voltage drop over the wire becomes a significant part of the overall circuit.
To answer the specific question, even though its slightly misleading, conductor resistance does tend to become important in high current circuits because the voltage drop over the conductor (Ohm's Law: Voltage is current times resistance) can become high. Even in high current circuits, however, if the conductor is substantially less resistive than the components, the tendency is still to ignore it, except that you have to account for heating of the conductors along with heating of the components.
Wiki User
∙ 12y ago
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What is an over-current protective device?
That is called a fuse. A fuse is a protective device, which will interrupt the flow of electricity if it is subjected to a current that is greater than its rating. Some fuses are designed to handle a large inrush of current and are used in circuits such as air conditioners, where a large amount of current is needed at startup, for a short duration and then current drops to a lower level. These are sometimes called time-lag fuses.
When cells are connected in parallel then?
putting cells in series gives you a higher voltage but at the same current rating. putting cells in parallel gives you the same voltage but at a higher current rating. series parallel can give you both..
How do you measure the resistance of a resistor with an ammeter and a voltmeter?
If all you have is a voltmeter, then resistance can only be calculated. If you know the total volts applied and current, either total current if in series ckt or current through the component if parallel type ckt, then the following formulas apply: R=Eapp÷It (series ckt) R=Eapp÷IR (parallel ckt)
Why do the current changes?
The amount of current that flows in a circuit is proportional to the voltage and inversely proportional to the resistance, as per Ohms law (I=V/R) where I is current.When resistances (IE loads) are connected in series, the total resistance is the sum of the loads (IE Rtotal = R1 + R2 + R3 ...)When they are connected in parallel, the total resistance is the inverse sum of the reciprocals of each resistance (IE 1/Rtotal = 1/R1 + 1/R2 + 1/R3 ...)Therefore in parallel the total resistance is much lower, and therefore at the same voltage more current will flow.
How does resisitance affect currents?
The higher the resistance the less current can pass through therefore the current will be lower.
What is advantage of a parallel circuit?
Parallel circuits have a higher current and a lower resistance.
How does the resistors work in a integrated circuit?
A resistor implements electrical resistance as a circuit element. It works in an integrated circuit by reducing current flow, and to lower voltage levels within circuits.
Why do solar cells need to lower resistance in the electrical circuits that make up their electronic system?
Reducing the resistance of solar cells increases the output current. Although the voltage remains the same the current is effected due to internal resistance. A reduction in output current can result in lesser diminished functioning in household appliances.
What is current trandformers?
I believe you meant transformer. If so it is a transformer used in high voltage circuits to reduce the current to a safer measurable value. It can be used as a direct input to a metering or protective relay to covert high currents to a lower value. It is used in AC circuits and typically encircles the conductor(s) it is monitoring, then works by using the expanding/ collapsing field which is the theory of induction used in transformer operation. It is the primary side of a "transformer" which only works when there is current flowing through it.
What is an over-current protective device?
That is called a fuse. A fuse is a protective device, which will interrupt the flow of electricity if it is subjected to a current that is greater than its rating. Some fuses are designed to handle a large inrush of current and are used in circuits such as air conditioners, where a large amount of current is needed at startup, for a short duration and then current drops to a lower level. These are sometimes called time-lag fuses.
The electric bulb in your household circuits are connected in parallel what happens to the line current and line voltage as you turn on more light bulbs?
The line current increases when more bulbs are switched on in parallel, since more parallel current paths results in lower effective resistance. The line voltage should not change in response to any normal use of electric power in a single house.
Is there any way to lower your bonds in tamagotchi v5.5?
i think that if you want to lower your bonds all you have to do is ignore their training calls hope this helps
Why the current flow from higher potential to lower potential?
Current defined as Positive charge flow , flows from higher potential to the lower. Current defined as electron flow, flows from lower potential to higher. In general Potential and Current are defined by positive charge.
What size wire do I need for a 60 amp service either 750 feet or 500 feet away?
It depends on the supply voltage because at that distance the size of the wire is calculated on the volt-drop which is 5% of the supply voltage, or 3% in some countries. The allowable resistance equals the volt-drop divided by the current, then you can use wire tables to find the wire size, remembering that a supply needs 2 wires which are in series so that their resistances add. <<>> To answer this question a voltage value has to be stated. This is due to the higher the voltage the lower the current on a specific load. The lower the current, the smaller the wire size can be.
Does the television set in your living room run on alternating current?
Yes, household power supplies are generally alternating current, whereas cells produce direct current. Of course they are are designed to run on a domestic power supply, but the first thing that happens inside the set, is that it is converted to DC. It is then reduced to lower voltages using inverters, to run the semiconductors of the circuits. Electronic circuits need DC at low voltages to work. TV sets that work off batteries and/or car power supplies, can dispense with the Inverters, as this is already at a more suitable voltage.
When cells are connected in parallel then?
putting cells in series gives you a higher voltage but at the same current rating. putting cells in parallel gives you the same voltage but at a higher current rating. series parallel can give you both..
What offers resistance to the circuit and limits the amount of current that can flow?
The internal components of a device that has been manufactured by a company adds up to the internal resistance of the device. Some devices are higher in resistance, some are lower. The results that you can see is on the device's nameplate and is represented by the wattage that the device draws.To answer the second part of the question, the answer is Ohm's law. The current of a circuit is directly proportional to the applied voltage and inversely proportional to the resistance of the circuit. In other words if the voltage remains the same, the higher the resistance the lower the current draw. A short circuit is no resistance, very high current. This is why over current protection is needed in most electrical circuits.
