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AP Physics 2
11.5 Compound Direct Current (DC) Circuits
11.4 Electric Power
11.3 Resistance, Resistivity, and Ohm’s Law
AdvancedMCQMathematicalConceptual15.8k
A schematic diagram of a single-loop DC circuit. On the left side, a DC voltage source labeled \(120\text{ V}\). The circuit loop proceeds clockwise through a top resistor labeled \(R_{\text{line}} = 6.0\text{ }\Omega\), representing the extension cord. On the right vertical branch, two identical resistors labeled \(R_1\) and \(R_2\) are connected in series. Straight wires complete the single closed rectangular loop. No other components or labels appear.
Circuit schematic of the space heater connected through an extension cord.
An electric space heater contains two identical resistive heating elements. When a single element is connected directly across an ideal \(120\text{ V}\) power supply, it dissipates a rated power of \(1200\text{ W}\). To operate the heater at a lower setting, the two elements are connected in series with each other. This series combination is then connected to the \(120\text{ V}\) power supply using an extension cord that adds a total line resistance of \(6.0\text{ }\Omega\) to the circuit. What is the total operating current drawn from the power supply when the heater operates at this lower setting?

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