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Why is the voltage stepped up prior to the transmition across the national grid?
Wiki User
∙ 14y ago
Electrical generators work at about 11,000 volts which is not enough to transmit power over long distances over about 5 miles. Therefore step-up Transformers are used to connect them to the local grid on 132 kV or the supergrid on 275 or 400 kV (in the UK)
Marques Hyatt
Wiki User
∙ 14y agoTo minimize the power loss associated with transmission. Power loss in the conductors used to transmit power is defined P = I^2 * R.
Another equation for power is P = V*I. To minimize the power loss and still provide the same amount of total power, current is decreased and voltage must be increased.
Wiki User
∙ 12y agoThere are two basic reasons:
First, when voltage is increased, current is reduced in the same proportion. Smaller current requires smaller conductors in order to deliver the same amount of power.
Second, due to the lower current and higher voltage, the percentage losses along the transmission path are greatly reduced, improving efficiency.
There is a practical limit to how high the voltage can go, however, because at extreme voltages energy tends to "leak" off of the wires directly into the air.
Wiki User
∙ 6y agoPower needs to be transmitted over a long distances. Due to long lengths the IR (Current and resistance) losses occur will be huge and directly proportional to I (current). At higher voltage the current remains low hence IR losses will be less. Hence the voltage is stepped up for transmission purposes.
Wiki User
∙ 7y agoVoltages are stepped up for transmission to reduce the resistance loses in the wires over long distances.
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Why is the voltage across a battery in a parallel circuit equal to the voltage across each bulb?
The voltage across a battery in a parallel circuit is equal to the voltage across each bulb because Kirchoff's Voltage Law (KVL) states that the signed sum of the voltages going around a series circuit adds up to zero. Each section of the parallel circuit, i.e. the battery and one bulb, constitutes a series circuit. By KVL, the voltage across the battery must be equal and opposite to the voltage across the bulb. Another way of thinking about this is to consider that the conductors joining the battery and bulbs effectively have zero ohms resistance. By Ohm's law, this means the voltage across the conductor is zero, which means the voltage across the bulb must be equal to the voltage across the battery and, of course, the same applies for all of the bulbs.
What does the voltage across a inductor do?
voltage across inductor create a flux. because of variation current developes an opposite emf.
What is the application of kirchoffs voltage law?
Kirchoff's Voltage Law: The sum of the voltage drops across all elements in a series circuit add up to zero. If you know the voltage drops across all but one element, and you know the voltage rise across the source, then you can easily calculate the remaining drop.
What is total voltage in a series circuits?
In a series circuit the total voltage is the sum of the voltage drops across all the component in series. When the voltage drops across each the individual components are added up, they will equal the supply (or applied) voltage.
What is the difference between voltage forward voltage and voltage drop?
Voltage is the potential difference between the source & any point in the circuit. The forward voltage is the voltage drop across the diode if the voltage at the anode is more positive than the voltage at the cathode (if you connect + to the anode). Voltage drop means, amount of voltage by which voltage across load resistor is less then the source voltage.
A voltage that has been stepped down is measured across the output terminals of a?
transformer
How is voltage stepped up in TV?
what is voltage? it is actually the potential difference across the two ends. and voltage is its SI unit when we switch on the television the circuit is completed and the electricity flows and then the radio transmitter starts working and we are able to see the program
Electricity in power stations is generated at 25 000 volts why is it transmitted across the National Grid system at 132 000 volts?
Voltage is stepped up to higher voltages for transmission in a power transmission system in order to reduce the current required to deliver a certain power and, as a result, to reduce the size of the conductors required. Remember that power is current times voltage, so increasing the voltage allows a reduction in current for the same amount of power. Also, remember that the size of the conductor is proportional to the amount of current alone. At the receiving substation, the transmission level voltage is stepped down to a distribution level voltage, typically in the range of 11 to 13KV. It is then stepped down to service level voltages at the local distribution transformer serving a business or a group of residences.
What can be inferred about voltage across the bulb?
what can be inferred about the voltage across the bulb
How does the voltage measured across a dry cell ompare with the voltage drop measured across three bulbs in series?
How does the voltage measured across a dry cell ompare with the voltage drop measured across three bulbs in series?
The voltage measured directly across an open switch in a circuit will be?
The voltage measured across an open in a series circuit is the equivalent of the sourse voltage.
Does voltage flow across a circuit or is it impressed across a circuit?
Voltage is impressed across a circuit. Current flows through a circuit.
Does voltage flow across or through a resistor?
No. If a voltage is applied across a resistor, a current flows through it.
Measure the voltage across a voltmeter and a switch?
If the switch is closed (connected) the voltage across it will read 0V. If the switch is open (disconnected) the voltage across it could be anything, it just depends on what the voltage between the wires going into the switch is.
The voltage drop across led is?
The voltage drop across an LED varies, but is typically around 2 volts.
Why is the voltage across a battery in a parallel circuit equal to the voltage across each bulb?
The voltage across a battery in a parallel circuit is equal to the voltage across each bulb because Kirchoff's Voltage Law (KVL) states that the signed sum of the voltages going around a series circuit adds up to zero. Each section of the parallel circuit, i.e. the battery and one bulb, constitutes a series circuit. By KVL, the voltage across the battery must be equal and opposite to the voltage across the bulb. Another way of thinking about this is to consider that the conductors joining the battery and bulbs effectively have zero ohms resistance. By Ohm's law, this means the voltage across the conductor is zero, which means the voltage across the bulb must be equal to the voltage across the battery and, of course, the same applies for all of the bulbs.
What will be the resultant voltage across different voltage points connected in parallel?
The voltages appearing across each branch of a parallel circuit will be equal to the supply voltage.
