There
are multiple ways to define voltage such as ….
-Voltage, provided by an energy source such as a battery, is what that causes current to flow.
-Voltage is
the difference in electric potential between two points, which (in a static electric field)
is defined as the work needed
per unit of charge to move a test charge between the two points.
-Voltage is the pressure from an electrical
circuit’s power that pushes charged electrons(current) through a conducting
loop, enabling them to do work such as illuminating a light
-Voltage, provided by an energy source such as a battery, is what that causes current to flow.
In the International System of Units, the derived unit for
voltage (potential difference) is named as ‘Volt”.
In SI units, work per unit charge is
expressed as joules per coulomb, where 1
volt = 1 joule (of work) per 1 coulomb (of charge). Voltage is also known as electric potential difference, electric pressure or electric tension whereas in electricity early days, voltage was known as electromotive force(emf). That’s why in equation such as Ohm’s law, Voltage is represented by the symbol E. Voltage or electric potential is symbolically denoted as ∆V or KV or V.
what is voltage Formula?
By Ohms law V=IR
V=P⋅R √V=P⋅R
Voltage across a capacitor:
1C⋅∫i(t)dt =v (t)1C⋅∫i(t)dt = v(t)
Voltage across an inductance:
V= L⋅didtV= L⋅didt
Faradays law of induction, which states
that a time changing magnetic flux induces a voltage in a conductor.
Ep = Np⋅dϕmdt
V=P⋅R √V=P⋅R
1C⋅∫i(t)dt =v (t)1C⋅∫i(t)dt = v(t)
V= L⋅didtV= L⋅didt
Ep = Np⋅dϕmdt
What
happens when two positively charged material is placed together?
When two positively charged material place together it will repel.
What is referred to the electron in the outer orbit?
Electron in the outer orbit is known as valence electron.
Mention what is the difference between generator and alternator?
Both generator and alternator work on the same principle they convert mechanical energy into electrical energy.
Generator: It converts induced emf (Electro Motive Force) into direct current, where it based on stationary magnetic field and revolving conductor which rolls on the armatures with slip rings and brushes riding against each other.
Alternator: It has rotating magnetic and stationary armature for high voltage and stationary magnetic field and a rotating armature for low voltage.
Is
it possible to measure E.M.F? If not, why?
Ans : The E.M.F cannot be measured but can be calculated in the way :-
E.M.F = Terminal voltage + Voltage drop inside the source of supply.
The E.M.F cannot be measured because the measuring instrument will cause some voltage drop due to consumption of some energy and the actual value will not come in appearance.
What is potential gradient?
Ans: The potential gradient is the space rate of change of potential with respect to distance.
When a larger number of lamps are connected in (a)Series and (b) Parallel what will happen to other lamps if one lamp is fused?
Ans: (a) None will glow due to break circuit . Other lamps will glow as usual.
What do you understand by E.M.F and potential difference of a call?
Ans: The voltage across the terminals of a cell in open circuit is called E.M.F of a cell, and the voltage across the terminals of a cell on load is called the potential difference of a cell.
How will you connect the cell (a)to increase the e.m.f and (b) to increase the supply of current?
Ans: (a) In series and (b) In parallel.
What will be the e.m.f of a battery of 6 cells each 2 volts if the cells are connected in (a) Series and (b) Parallel?
Ans:
(a) If cells are connected in series then emf will be 6 × 2V = 12 volts and
(b) if cells are connected in parallel then emf will be 2 volts.
When two positively charged material place together it will repel.
What is referred to the electron in the outer orbit?
Electron in the outer orbit is known as valence electron.
Mention what is the difference between generator and alternator?
Both generator and alternator work on the same principle they convert mechanical energy into electrical energy.
Generator: It converts induced emf (Electro Motive Force) into direct current, where it based on stationary magnetic field and revolving conductor which rolls on the armatures with slip rings and brushes riding against each other.
Alternator: It has rotating magnetic and stationary armature for high voltage and stationary magnetic field and a rotating armature for low voltage.
Ans : The E.M.F cannot be measured but can be calculated in the way :-
E.M.F = Terminal voltage + Voltage drop inside the source of supply.
The E.M.F cannot be measured because the measuring instrument will cause some voltage drop due to consumption of some energy and the actual value will not come in appearance.
What is potential gradient?
Ans: The potential gradient is the space rate of change of potential with respect to distance.
When a larger number of lamps are connected in (a)Series and (b) Parallel what will happen to other lamps if one lamp is fused?
Ans: (a) None will glow due to break circuit . Other lamps will glow as usual.
What do you understand by E.M.F and potential difference of a call?
Ans: The voltage across the terminals of a cell in open circuit is called E.M.F of a cell, and the voltage across the terminals of a cell on load is called the potential difference of a cell.
How will you connect the cell (a)to increase the e.m.f and (b) to increase the supply of current?
Ans: (a) In series and (b) In parallel.
What will be the e.m.f of a battery of 6 cells each 2 volts if the cells are connected in (a) Series and (b) Parallel?
Ans:
(a) If cells are connected in series then emf will be 6 × 2V = 12 volts and
(b) if cells are connected in parallel then emf will be 2 volts.
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