What are the dangers of AC current?
A.C. is said to be four to five times more dangerous than D.C. For one thing, A.C. causes more severe muscular contractions. For another, it stimulates sweating, which lowers the skin resistance. Along those lines, it is important to note that resistance goes down rapidly with continued contact.
Why don’t we use AC current?
The answer to why DC current is not used in homes goes back to the inherent characteristics of direct currents and their weaknesses compared to Alternating Currents (AC). In fact, AC currents can be easily transmitted over long distances without much loss. They are also safer in direct touch at an equal voltage.
What is the current in an AC circuit?
Alternating current (AC) is an electric current which periodically reverses direction and changes its magnitude continuously with time in contrast to direct current (DC) which flows only in one direction.
Which current is used in home?
Alternating current
Alternating current (AC) electricity is the category of electricity usually used in homes and businesses. Direct current (DC) means the unidirectional stream of electric charge. Most of the digital electronics use DC.
How do you increase the current in an AC circuit?
2 ways to increase the current in a circuit
- Raise the voltage while maintaining the resistance;
- Lowering the resistance while maintaining a steady voltage;
How is the current written in an AC circuit?
After an initial “transient time,” an AC current will flow in the circuit as a response to the driving voltage source. The current, written as 12-2. It()=I0 sin(ωt−φ) (12.1.2) will oscillate with the same frequency as the voltage source, with an amplitude I0 and phase φ that depends on the driving frequency.
Is the current constant in DC and AC?
Figure 1 shows graphs of voltage and current versus time for typical DC and AC power. The AC voltages and frequencies commonly used in homes and businesses vary around the world. Figure 1. (a) DC voltage and current are constant in time, once the current is established.
How many times does an AC current swing?
This means that the AC voltage swings from 170 V to –170 V and back 60 times every second. An equivalent DC voltage is a constant 120 V. Peak power is peak current times peak voltage.
What causes an alternating current in a circuit?
Alternating-Current Circuits 12.1 AC Sources. In Chapter 10 we learned that changing magnetic flux can induce an emf according to Faraday’s law of induction. In particular, if a coil rotates in the presence of a magnetic field, the induced emf varies sinusoidally with time and leads to an alternating current (AC), and provides a source of AC power.
