Difference between revisions of "electric circuits basics"
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A '''direct current (dc)''' is a current that remains constant with time. An '''alternating current (ac)''' is a current that varies sinusoidally with time. | A '''direct current (dc)''' is a current that remains constant with time. An '''alternating current (ac)''' is a current that varies sinusoidally with time. | ||
| + | ====Voltage==== | ||
| + | '''Voltage''' (or potential difference) is the energy required to move a unit charge through an element, measured in volts (V). | ||
Latest revision as of 16:06, 30 September 2018
Contents |
DC Circuits
Basic Concepts
Systems of Units
Charge and Current
Charge is an electrical property of the atomic particles of which matter consists, measured in coulombs (C).
1 coulomb = charge transferred by 1 ampere in 1 second or 1 C = 1 A * 1 s = 6.242×10^18 protons
Electric current is the time rate of change of charge, measured in amperes (A).
1 amp = 1 coulomb / sec
A direct current (dc) is a current that remains constant with time. An alternating current (ac) is a current that varies sinusoidally with time.
Voltage
Voltage (or potential difference) is the energy required to move a unit charge through an element, measured in volts (V).
Power is the rate of doing work, the amount of energy transferred per unit time. Measured in watts
Energy is the capacity to do work, measured in joules (J).
