characteristics

characteristics - Note-A-Rific: Characteristics Any path...

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Note-A-Rific: Characteristics Any path along which electrons can flow is a circuit. For a continuous flow of electrons, there must be a complete circuit with no gaps. A gap is usually an electric switch that can be closed to allow electron flow or open to cut it off. There is a standard set of symbols used to represent parts of a circuit (you’ve already seen a couple). o Check out the diagrams on page 641 of the text book… you must memorize these! If I wanted to draw a diagram of a light bulb powered by a battery that can be turned off and on, it might look like this… Most circuits that are found in homes have more than one device hooked up. Two main types of circuits are series or parallel. Series ! a single pathway for electron flow between the terminals of the battery Parallel ! branches, each of which is a separate path for the flow of electrons Series Circuit When the switch is closed, a current exists almost immediately in all three lamps. There is only one pathway that you can trace with your finger, so this is a series circuit. The current does not "pile up" in any lamp but flows through each lamp. Electrons that make up this current leave the negative terminal of the battery, pass through each of the resistive filaments in the lamps in turn, and then end up at the positive terminal of the battery.

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The same amount of current passes through the battery, since it is part of the circuit. A break anywhere in the path results in an open circuit, and the flow of electrons stops. o Burning out of one of the lamp filaments or simply opening the switch could cause such a break. Important characteristics of series connections : 1. Electric current has a single pathway through the circuit. This means that the current passing through each resistor is the same . 2. This current is resisted by the first resistor, the second resistor, and the third resistor also. The total resistance to current in the circuit is the sum of the individual resistances along the circuit path. 3. The current in the circuit is equal to the voltage supplied by the source divided by the total resistance of the circuit. (I = V / R total ) 4. The voltage drop (potential difference) across each device is proportional to its resistance. This is because
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This note was uploaded on 02/29/2012 for the course PHYS 227 taught by Professor Rabe during the Fall '08 term at Rutgers.

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characteristics - Note-A-Rific: Characteristics Any path...

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