Physics Current And Circuits Study Guide Answers
How Ohm's Law Works Ohm's law describes the way current flows through a resistance when a different electric potential (voltage) is applied at each end of the resistance. One way to think of this is as water flowing through a pipe. The voltage is the water pressure, the current is the amount of water flowing through the pipe, and the resistance is the size of the pipe. More water will flow through the pipe (current) the more pressure is applied (voltage) and the bigger the pipe is (lower the resistance). Example Problems 1. If the resistance of an electrical circuit is increased, what will happen to the current assuming the voltage remains the same?
Answer: The current will decrease. If the voltage across a resistance is doubled, what will happen to the current? Answer: The current will double as well. Explanation: If you look at the equation V= IR, if R stays the same then if you multiple V.2 (double the voltage), you must also double the current for the equation to remain true. What is the voltage V in the circuit shown?
Physics Current And Circuits Study Guide Answers
Answer: V = I. R = 2 x 13 = 26 volts Interesting Facts about Ohm's Law. It is generally applied only to direct current (DC) circuits, not alternating current (AC) circuits. In AC circuits, because the current is constantly changing, other factors such as capacitance and inductance must be taken into account.
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The concept behind Ohm's law was first explained by German Physicist Georg Ohm who the law is also named after. The tool for measuring volts in an electric circuit is called a voltmeter. An ohmmeter is used for measuring resistance. A multimeter can measure several functions including voltage, current, resistance, and temperature.
Physics Study Guide Answers
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