Download Chapter 36 Summary – Magnetism

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Electricity Overview
Directions: circle the word that would correctly complete the sentence.
Static electricity is when (charges, circuits) accumulate on the (inside, surface) of an object which gains or loses
(electrons, branches) which move more easily on a (conductor, insulator) than they do on a (conductor, insulator). A
negatively charged object has (fewer, more) electrons than a neutral object. Current, which is the flow of (voltage,
charge), flows from (high, low) voltage to (high, low) voltage. This is why we need a (current, voltage) source to
maintain a (voltage, resistance) difference which causes (volts, charge) to flow. The 2 types of current flow are AC,
which stands for (average, alternating) current, and DC, which stands for (different, direct) current. A good example of a
DC voltage source is a (battery, generator), where charges move (one, either) direction. A good example of an AC
voltage source is a (battery, generator), where charges (switch, hold) directions. We need a complete (list, circuit) for
charges to flow. If there is only 1 path, that is a (series, parallel) circuit. If there are multiple paths, that is a (series,
parallel) circuit. (Current, Voltage) is the same everywhere in a series circuit. (Current, Voltage) is the same at each
branch of a parallel circuit. In a series circuit, total resistance will be (smaller, bigger) than any 1 resistor. In a parallel
circuit, total resistance will be (smaller, bigger) than any 1 resistor. If too much (voltage, current) flows in a circuit, the
fuse will melt, or the breaker will pop, so that the wires don’t overheat, melt, and catch fire. The voltage difference
between the holes of a common wall outlet is (12, 120) volts. (Resistance, Power) is the opposition to current flow, and
measured in (ohms, coulombs). The power needed to operate an appliance is measured in (watts, volts), and calculated by
multiplying (current, resistance) by (volts, watts). Electrical energy, which is what the power company charges, is
(power, voltage) x time. Ohm’s law says that current is (directly, inversely) related to voltage, and (directly, inversely)
related to resistance. The power formula says that power is (directly, inversely) related to current, and (directly,
inversely) related to voltage. Another general rule is that long, thin, hotter wires have (higher, lower) resistance, and
shorter, fatter, cooler wires have (higher, lower) resistance.