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# Electric Circuits

Define direct current (DC). Current flowing in ONE direction.
What are the 3 components of an electric current? Battery, conductor, Load/resistance
What does a voltmeter do? Measures the POTENTIAL DIFFERENCE between any two points in a circuit.
What does an ammeter do? Measures amps and is connected in series in the circuit.
What is the formula for OHM's Law? V = I x R
Define series circuit. Electric circuit whose component parts are arranged end-to-end so that the current passes consecutively through each part.
What is the formula for a volt circuit series? V(t) = V(1) + V(2) + V(3)
What is the formula for an amp circuit series? I(t) = I(1)/R = I(2)/R = I(3)/R
What is the formula for a ohm circuit series? R(t) = R(1) + R(2) + R(3)
Define parallel circuit. Component parts are connected as branches of main circuit so that current is divided among them.
Define power. The electric energy expended per second.
What is the formula for power? P = I*V
What is the UNIT for power? Watt
What is the formula for the amp parallel circuit? I = i1/R + i2/R + i3/R
What is the formula for the voltage parallel circuit? V = v1 = v2 = v3
What is the formula for the resistance parallel circuit? R = r1 + r2 + r3
What circuit device must be connected in parallel? Voltmeter
What are the required indicators on the x-ray exposure switch? Audible, Visible
Where in the basic x-ray circuit is the timer located? Between the exposure switch and step-up transformer

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