0
Why there is no current in a light bulb unless it is connected across a source of applied voltage?
Wiki User
∙ 10y ago
because i dont know
Wiki User
∙ 10y ago
Add your answer:
Earn +20 pts
How capacitor opposes the change in current?
as a voltage is applied across a capacitor charges accumulate on the plates.due to accumulation of charges,electric field between the plates develop in the direction opposite to the applied field.this field give rise to the potential across the plates.if the plates get completely charged due to the applied voltage i.e if the whole of the charge q=c(capacitance of the capacitors)xv(voltage applied) develops on the plates,then the applied voltage wiil be opposed to an extent that no further charges will induce on it.But in practice,it takes very long time for the capacitor to get completely charged due to the applied voltage..............now coming to ac circuits,having capacitor.......if the frequency of ac applied voltage is less then the voltage will change slowly.due to this at each instant large amount of charge will develop on the plates causing large opposition.vice versa to high frequency applied voltage.
What is the total current flowing through a 45 ohm resistor 1.4 amps and 20 ohm resistor 1.8 amps?
That depends on several factors that aren't specified in the question: -- whether the resistors are connected to each other -- whether they're connected in series or in parallel -- the voltage applied across the ends of the circuit While these two resistors are in their plastic packages hanging on the wall at Radio Shack, the total current flowing through both of them is zero.
Is it possible to apply voltmeter across a variable resistor?
Of course. A good voltmeter can be applied across anything, since its impedance is high and its presence has no effect on the operation of the circuit. When it's connected across a variable resistor, the voltmeter most likely reveals a changing voltage as the resistor is varied.
Tripling the current in a circuit with constant resistance has the effect of changing the power by what factor?
Power dissipated is ( I2 R ).If you triple the voltage across a constant resistance, it will dissipate9 times as much power as it did before the voltage changed.
What is restriking voltage?
Restriking voltage is transient voltage. During the arcing time, at current zero, the voltage that shows up across the contacts is the restriking voltage.
Ac voltage applied across a load resistance produce alternating current?
The reason an AC voltage applied across a load resistance produces alternating current is because when you have AC voltage you have to have AC current. If DC voltage is applied, DC current is produced.
Does voltage flow across or through a resistor?
No. If a voltage is applied across a resistor, a current flows through it.
When does current flow through a conductor?
When a voltage is applied across it.
What is current coil and voltage coil?
The current coil is one through which the current of source can pass. This coil is connected in series. The voltage coil is connected parallel to the applied voltage. In the current coil the quantity of current flowing is proportional to the current flowing in load while in the voltage coil, current flowing is proportional to applied supply voltage. The voltage coil current is independent of current flow in load. For a complete understanding, please refer to a watt meter diagram.
What is the voltage drop across each phase if a wye connected load has a voltage of 480 v applied to it?
.24
1 If the voltage applied across a capacitance is triangular in waveform then the waveform of the current is?
rectangular
Connected in series or parallel will each bulb glow brighter?
In parallel, each bulb will have full voltage applied across them. However, in series, the voltage across each bulb won't be the same as supply voltage. Thereby, bulbs connected in parallel will glow brighter.
Why must a light bulb be connected to both ends of a battery to light up?
For current to flow through the lamp, there must be a potential difference (voltage) applied across opposite ends of that lamp.
What type of voltage must be passed across a transformer?
A transformer must be connected to an alternating current (AC) supply of the correct voltage.
What is the current through the 150 ohm resistor?
It depends on the voltage applied across it. But the maximum current is limited by the power-rating of the resistor (power divided by the square of the voltage).
A 4000-Ω resistor is connected across 220 V what current will flow?
A 4000-Ω resistor is connected across 220 V will have a current flow of 0.055 A.Ohm's law: Voltage equals Current times Resistance
How much current will flow through a 12 ohm resistor if 6 volts are applied across it?
Voltage / Resistance = Current, you do the math
