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Why is heat generated across a resister when electric field is applied?
Wiki User
∙ 11y ago
An electric current contains energy; so does an electric field. When a current flows through a resistor, part of the electrical energy will be wasted - i.e., converted to heat. You can think of this as if some of the electrons crash into atoms, instead of continuing on their way.
Wiki User
∙ 11y ago
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What does piezoelectricity mean?
Piezoelectricity is the ability of some materials (notably crystals and certain ceramics , pincluding bone to generate an electric field or electric potential in response to applied mechanical stress. The effect is closely related to a change of polarization density within the material's volume. If the material is not short-circuited , the applied stress induces a voltage across the material. The word is derived from the Greek piezo or piezein, which means to squeeze or ress.
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.
Most force must be applied when pushing something across a rough surface?
false
What is an contuctor?
material or an object that conducts heat, electricity, light, or sound. Electrical conductors contain electric charges (usually electrons) that are relatively free to move through the material; a voltage applied across the conductor therefore creates an electric current. Insulators (electrical nonconductors) contain no charges that move when subject to a voltage. Compareinsulator. See alsoresistance, superconductivity.
Why there is no current in a light bulb unless it is connected across a source of applied voltage?
because i dont know
What is a 1.5 omega resister?
The capital Greek letter Ω (omega) is the symbol for Ohms - the unit of resistance. A 1.5Ω resister is a resistor with quite a low resistance. If a voltage of 1.5 Volts is applied across it, a current of 1 Amp[ere]s will flow through it.
What is leakage resistance?
leakage resistance of a resister is type of fault which occurs at a specific voltage across the resister which are undertesting.
Why load resister is conected across the circuits?
Load resistors are connected across the circuit to limit the current flowing through the load.
How is elecreicity generated?
Electricity can be generated through a generator. It can also be made by rubbing your slippers across the carpet.
How electricity generated in dyanamo?
A dynamo is an electric generator. The basic principle is that, when a wire (or any conductor, for that matter) moves through a magnetic field, a voltage is is induced across the wire. This will cause current to flow.
What is the physical standard used to establish the length of a second?
a crystal when cut to specific dimensions will vibrate at a particular frequency when an electric potential is applied across it. The length of the second is standardized by the Cs crystal.
Why the net resistance increases in series connection?
series network consists of components i.e resisters connected end to end. since their is only one path for the flow of current. but potential drop across each resister is different. so thats the reason that series network has maximum resistence then the highest resister in combination. the same amount of current passes through each resister.
Why resistor needed to know the characteristics of diode?
The resister always being used to save components to damage by absorbing extra voltages, diode works on 0.7 volts n usually having 15 volts from the source so extra voltages drops across the resister and it works safely.
Why ac voltage is always applied across capacitor?
It's not.
When does current flow through a conductor?
When a voltage is applied across it.
Does voltage flow across or through a resistor?
No. If a voltage is applied across a resistor, a current flows through it.
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