130 Direct Current CircuitsQ28.6Q28.7In series, the current is the same through each resistor. Without knowing individual resistances,nothing can be determined about potential differences or power.Q28.8In parallel, the potential difference is the same across each resistor. Without knowing individualresistances, nothing can be determined about current or power.Q28.9In this configuration, the power delivered to one individual resistor is significantly less than if onlyone equivalent resistor were used. This decreases the possibility of component failure, and possibleelectrical disaster to some more expensive circuit component than a resistor.Q28.10Each of the two conductors in the extension cord itself has a small resistance. The longer theextension cord, the larger the resistance. Taken into account in the circuit, the extension cord willreduce the current from the power supply, and also will absorb energy itself in the form of internalenergy, leaving less power available to the light bulb.
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