Cost of Energy
The electrical energy produced by a power
station is delivered to a large number of
consumers. The tariff is the rate at which
electrical energy is sold naturally becomes
attention inviting for electric supply company.
1- Recovery of cost o
A high voltage supply should have high internal resistance. Why?
If the internal resistance of a high voltage supply is small, then on accidental short-circuit, a
damaging large current will flow through the source of e.m.f. This may damage the high vol
They are used to represent certain devices that exhibit a constant-current behavior.
Transistors are examples of such devices
Current sources can also be used to represent equipment such as current-regulated power
supplies. These supplies p
There are some networks in which resistances are neither in series nor in parallel. A familiar example is a
three terminals network e.g. delta network or star network. In such situations, it is not possible to
simplify the network by series and parallel c
The resistance of human body is quite high. Why does one experience a strong shock from 230 V supply?
- The human body is very sensitive to even minute current. A current as low as a feq mA can greatly
affect the nervous system.
Like poles repel each other while unlike poles attract each other
The force between two magnetic poles is directly proportional to the product of their pole
strengths and inversely proportional to the square of distance between their centers.
Ableiter_Buch_Umschlag_uk.FH10 Tue Feb 18 17:18:28 2003
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Why does the glow of lamps become weaker when a heavy current appliance is switched on in the
Domestic appliances are connected in parallel across the supply. When a heavy current
appliance is switched, the total resistance of the system in the r