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Why you use ac for transmission?
AC is used for transmission because AC can be stepped up in voltage with a transformer, and then stepped back down at the destination. Since power is voltage times current, a higher voltage requires a smaller current to achieve the same power. Since the current carrying capacity of wires is based on wire size, a smaller wire size can be used to transmit the lower current.
How does changing the voltage increase the efficiency of power transmission?
Changing the voltage during power transmission increases efficiency by reducing current flow for the same power level, which minimizes energy losses due to resistance in the transmission lines. Higher voltage allows for lower current, resulting in reduced I²R losses (where I is current and R is resistance). This means that less energy is wasted as heat, improving the overall efficiency of the power transmission system. Additionally, efficient voltage levels can enable longer transmission distances with less energy loss.
Why are transformers used to increase the voltage before transmission?
Using a higher voltage reduces power losses during transmission.
What happen when voltage decreases and current increases?
Yes. As long as the load stays the same. Voltage equals the resistance of the load times the current or amperage. Or , in this case, as an example, if the load is the same, the voltage is 240 and current is 10 amps. At 120 volts, the current is 20 amps. Current x resistance(or the load)=voltage. With simple math, the equation can be moved around.
Why do the transmission cables need to be thicker when power is transmitted at a lower voltage over long distances?
High-voltage transmission relies on the fact that for a given amount of power (watts), as the voltage goes up, the current (amps) goes down. The main issue with long distance transmission is voltage drop, which is proportional to current. Consider a transmission system supplying a 1 megawatt load. At 132,000 volts (3-phase), the current will be about 4.4 Amps (132kV X 4.379A X 1.73 = 1MW). Now, even 14 gauge wire would carry 4 or 5 amps, But the wire will have to be much larger than that to limit voltage drop to an acceptable level. The cost of the line itself is relatively small, BUT you have to buy transformers, one for each end! Utility-grade high voltage transformers are enormously expensive, and the hardware for high voltage transmission is also more expensive. Now consider a hypothetical transmission system supplying the same 1MW load, but now our transmission voltage is 4,160 volts. The current would now be 139 Amps! (4,160V X 138.9A X 1.73 = 1MW). You can see that the conductors must be very large to carry that much current. The problem is we still have to make the conductors larger to make up for voltage drop, and we end up with huge conductors. Of course, now you don't have to buy expensive high-voltage transformers! This is an extreme example just to make the point, by the way. At some distance, the cost of the transformers and associated hardware will equal the cost to eliminate them and just use larger conductors. At any distance less than that, it will be cheaper to use the low-voltage, high current setup. At any greater distance, the cost of the transformers, etc. will be more than offset by the cheaper transmission infrastructure (smaller conductors, etc.).
Why is the voltage stepped up before transmission?
Voltage is stepped up before transmission in electrical power systems to reduce energy losses during long-distance transmission. According to Ohm's Law, power loss is proportional to the square of the current, so by increasing the voltage and reducing the current, the power loss can be minimized. Additionally, higher voltages allow for the use of thinner and lighter conductors, reducing material costs and making the transmission more efficient.
What is the reason why it is better to use high voltage instead of low voltage on long distance?
High voltage reduces the amount of energy lost due to the resistance of the transmission material (conductor), by reducing the current. In other words, increasing voltage reduces current, and lower current means less resistance loss. Voltage and current have an inverse relationship, and later on when the electricity gets closer to the consumer, voltages can be decreased which increases the current. Increased current means higher resistance, and it is resistance that does the work.
Why is it electrical power is normally transmitted at high voltage?
Simplistically Power is Voltage times Current. Sending at domestic voltage requires much more current to be sent for the same power and therefore much thicker wires, heavier equipment and more repeater transformers as over distance the resistance of the wires and switches would cause the voltage to fall quickly below domestic. For the same power delivery, sending at higher voltages requires less current, lighter wires, and voltage losses over distance are more easily managed so much less equipment is required.
Does higher voltage result in higher current flow?
Yes, higher voltage typically results in higher current flow in a circuit, according to Ohm's Law.
Why you use ac for transmission?
AC is used for transmission because AC can be stepped up in voltage with a transformer, and then stepped back down at the destination. Since power is voltage times current, a higher voltage requires a smaller current to achieve the same power. Since the current carrying capacity of wires is based on wire size, a smaller wire size can be used to transmit the lower current.
When a circuit is inductive the current has what voltage?
This doesn't make sense, "current" is "amperage" so the higher the voltage the lower the amperage, and the lower the voltage the higher the amperage.
Why are transformers used to increase the voltage before transmission?
Using a higher voltage reduces power losses during transmission.
Why is alternating current more effective at long-distance travel than direct current?
Alternating current is more effective for long-distance travel than direct current because it can be easily converted to higher voltages, which reduces energy loss during transmission over long distances. This is due to the ability of alternating current to use transformers to increase voltage and decrease current, resulting in lower energy losses compared to direct current.
What happen when voltage decreases and current increases?
Yes. As long as the load stays the same. Voltage equals the resistance of the load times the current or amperage. Or , in this case, as an example, if the load is the same, the voltage is 240 and current is 10 amps. At 120 volts, the current is 20 amps. Current x resistance(or the load)=voltage. With simple math, the equation can be moved around.
Why is it important to select a high voltage and low current during trnsmission of electricity?
For a given load, the higher the supply voltage, the lower the load current. By using higher transmission voltages, the resulting lower currents ensure (a) minimal voltage drops along the lines, (b) conductors of practical size, and (c) less line losses.
Electrons flow from areas of higher to lower voltage or from areas of lower to higher voltage?
Electronsflow from areas of lower to higher voltage, while Current flow from areas higher to lower voltage.
High voltage will trip a circuit breaker?
A higher voltage means that a higher current will flow in the same load. It is the current that causes the breaker to trip.
