Physics textbook: pages 544-552
- a flow of electrons is called an electric current
- a current, much like a water current, flows from a positive terminal to a negative terminal
- equation for a current: I = Q/t, where I represents current in amperes, Q represents the quantity of the current, t represents time in seconds
- an ammeter is used to measure currents of two types: direct current (DC) and alternating current (AC)
- DC: the current flows in one direction from a power supply (ex. battery) to the load (ex. lightbulb), then back to the power supply
- AC: the current has electrons that reverse because of electric and magnetic fields; the path of the current is also known as a circuit
- the equation to show the electric potential difference used is V = E/Q; V is the electric potential difference in volts, E is energy in joules, and Q is the charge in coulombs
- the equation E = Vlt calculates the energy transferred by charge flow
- a voltmeter is used to measure potential difference
- throughout the world, there are many different ways to convert energy from chemical, mechanical, thermal, and light to electric potential energy; wind, coal, oil, nuclear plants, and solar energy, among many examples, may be used
checked.
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