To confirm Ohm's law, an experiment is performed with a battery, an ammeter, a voltmeter, and a resistor connected as shown above. 1. A resistor is connected to a variable power supply in a simple series circuit. Students collect data on the current I in the circuit as the voltage V of the power supply is increased. Which of the following best describes a feature of the graph that demonstrates that the resistor is not ohmic? (A) Both axes have the same scale. (B) The graph does not go through the origin. (C) The current is on the horizontal axis, not the vertical axis. (D) The graph goes through the point (3,3). (E) The graph is not linear.
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This means that if a resistor is ohmic, the graph of current versus voltage should be a straight line passing through the origin. (A) The scale of the axes does not determine whether a resistor is ohmic or not. (B) If the graph does not go through the origin, Show more…
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Figure $27-27$ shows a circuit of four resistors that are con- nected to a larger circuit. The graph below the circuit shows the electric potential $V(x)$ as a function of position $x$ along the lower branch of the circuit, through resistor $4 ;$ the potential $V_{A}$ is $12.0 \mathrm{~V}$. The graph above the circuit shows the electric potential $V(x)$ versus position $x$ along the upper branch of the circuit, through resistors $1,2,$ and $3 ;$ the potential differences are $\Delta V_{B}=2.00 \mathrm{~V}$ and $\Delta V_{C}=$ $5.00 \mathrm{~V}$. Resistor 3 has a resistance of $200 \Omega$. What is the resistance of (a) resistor 1 and (b) resistor $2 ?$
Figure $27-27$ shows a circuit of four resistors that are connected to a larger circuit. The graph below the circuit shows the electric potential $V(x)$ as a function of position $x$ along the lower branch of the circuit, through resistor 4 ; the potential $V_{A}$ is 12.0 $\mathrm{V}$ . The graph above the circuit shows the electric potential $V(x)$ versus position $x$ along the upper branch of the circuit, through resistors $1,2,$ and $3 ;$ the potential differences are $\Delta V_{B}=2.00 \mathrm{V}$ and $\Delta V_{C}=5.00 \mathrm{V} .$ Resistor 3 has a resistance of 200$\Omega .$ What is the resistance of (a) resistor 1 and (b) resistor 2?
a. What is the potential difference across each resistor in Figure P23.8? b. Draw a graph of the potential as a function of the distance traveled through the circuit, traveling clockwise from $V=0 \mathrm{V}$ at the lower left corner. See Figure $\mathrm{P} 23.9$ for an example of such a graph.
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