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Electronics Fundamentals, Ch. 3 Ohm's Law, Energy, and Power Part 1 DC Circuits
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Terms in this set (15)
Ohm's law
A law stating that current is directly proportional to voltage and inversely proportional to resistance.
linear
Characterized by a straight-line relationship.
energy
The ability to do work. The unit is the joule (J).
joule (J)
The SI unit of energy.
watt (W)
The unit of power. One watt is the power when 1 J of energy is used in 1 s.
kilowatt-hour (kWh)
A large unit of energy used mainly by utility companies.
Watt's law
A law that states the relationships of power to current, voltage, and resistance.
power rating
The maximum amount of power that a resistor can dissipate without being damaged by excessive heat buildup.
voltage drop
The decrease in voltage across a resistor due to a loss of energy.
power supply
A device that converts ac from the utility lines to a dc voltage.
efficiency
The ratio of the output power to the input power of a circuit, usually expressed as a percent.
Ah rating
A capacity rating for batteries determined by multiplying the current (A) times the length of time (h) a battery can deliver that current to a load.
troubleshooting
A systematic process of isolating, identifying, and correcting a fault in a circuit or system.
half-splitting
A troubleshooting procedure where one starts in the middle of a circuit or system and, depending on the first measurement, works toward the output or toward the input to find the fault.
power
The rate of energy usage. The unit is the watt (W).
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