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electricty short answers Use
Terms in this set (10)
Explain why you may produce a static discharge if you touch a metal doorknob after walking on a wool carpet.
Friction between your shoe and the wool causes a transfer of electrons from the carpet to you. Your body now has a static charge. When you touch the metal knob, electrons suddenly move from your body through your fingertips to the metal doorknob as a static discharge.
What are the basic features of an electric circuit?
A circuit has a source of electrical energy, such as a battery. A circuit also has a device that is run by electrical energy, such as a light bulb. Conducting wires and a switch are used to connect the elements of a circuit, and to turn the circuit on and off.
What is a charge's electric field?
the effect an electric charge has on other charges in the space around it
What is the law of conservation of charge?
It is a law that states that the total charge in an isolated system is constant
What is a circuit breaker?
a switch that opens when current in a circuit is too high
Electric current is used for different purposes. Compare the use of electric current by a computer and by a toaster
A computer uses electric current to process or transmit information, while a toaster uses electric current to change electrical energy into thermal energy.
Why is a wire coated with rubber or plastic?
Rubber and plastic are electrical insulators. Placing coating of plastic or rubber around the wire helps to controls the current.
If the voltage is 90 volts and the resistance is 30 ohms, what is the
current? Explain your answer
IT = 90 volts/30 ohms
Answer: IT = 3 amperes
What are two types of electronic signals, and how is each
digital-Encodes information as a string of 1s and 0s
analog- produced by continuously changing the voltage or current in a circuit
What are the three most useful solid-state components
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