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Published byStewart Dalton Modified over 4 years ago

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Current, Resistance, and Simple Circuits

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A capacitor is a device used to store electrical energy. There are two different ways to arrange circuit components: Series Current is constant, voltage varies Parallel Current varies, voltage is constant Review

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Current – The flow of electric charges through a piece of material. Throughout these notes, we are going to compare circuits to water. Current is like the speed that water is flowing. Rapids would represent a large current. Current is the rate at which charges flow through a specific area. Current

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# of Charges Duration (Time)

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Resistance – A charged particle’s resistance to a change in motion in response to an external force. Resistance is like the widening or shrinking of a pipe to change the rate of flow of water through a pipe. Resistors are used to control the current in different parts of a circuit. Resistance

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Current, Resistance, and Voltage all affect each other. Voltage is the push. Current is the flow. Resistance is the slowing down of current. Ohm's Law Demo Ohm's Law Demo Ohm’s Law

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Voltage Current Resistance

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Resistivity Length of Material Cross-Sectional Area Temperature Temperature Coefficient of Resistivity

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Electrical Power

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Direct Current Circuit (DC) – A circuit that has a current that is constant in magnitude and direction. Alternating Current Circuit (AC) – A circuit that has current that is changing in magnitude and direction. Electromotive Force – The maximum possible voltage that a battery can provide (Symbol: ε) Direct vs. Alternating Current

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Remember the symbols from last week: Wire Battery Capacitor Switch And two new ones: Resistor Light Bulb Circuit Design

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Resistors in Series R1R1 R2R2 R3R3 Battery

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Resistors in Parallel R1R1 R2R2 R3R3 Battery

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Let’s take a look at why Current and Voltage change depending on the type of circuit we have. Circuit Construction Circuit Construction

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Calculate the current and voltage delivered to each resistor in the circuit shown below. Practice Problem 18 Volts 4 Ohms 2 Ohms 3 Ohms 1 Ohm

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