130 Direct Current Circuits Q28.6 Q28.7 In series, the current is the same through each resistor. Without knowing individual resistances, nothing can be determined about potential differences or power. Q28.8 In parallel, the potential difference is the same across each resistor. Without knowing individual resistances, nothing can be determined about current or power. Q28.9 In this configuration, the power delivered to one individual resistor is significantly less than if only one equivalent resistor were used. This decreases the possibility of component failure, and possible electrical disaster to some more expensive circuit component than a resistor. Q28.10 Each of the two conductors in the extension cord itself has a small resistance. The longer the extension cord, the larger the resistance. Taken into account in the circuit, the extension cord will reduce the current from the power supply, and also will absorb energy itself in the form of internal energy, leaving less power available to the light bulb. Q28.11
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This note was uploaded on 12/14/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .