https://www.khanacademy.org/science/ap-physics-2/x0e2f5a2c:electric-circuits/x0e2f5a2c:current-resistivity-ohms-law/v/circuits-part-1 2024-05-29T15:10:23.071133296Z Ohm's law Ohm's Law is V = IR, where V = voltage, I = current, and R = resistance. Ohm's Law allows you to determine characteristics of a circuit, such as how much current is flowing through it, if you know the voltage of the battery in the circuit and how much resistance is in the circuit. Sal Khan video https://cdn.kastatic.org/ka_thumbnails_cache/b84a04ee-f19e-4ed0-aabf-21b4d0f8b903_1280_720_base.png Ohm's law Ohm's Law is V = IR, where V = voltage, I = current, and R = resistance. Ohm's Law allows you to determine characteristics of a circuit, such as how much current is flowing through it, if you know the voltage of the battery in the circuit and how much resistance is in the circuit. https://cdn.kastatic.org/ka-youtube-converted/F_vLWkkOETI.mp4/F_vLWkkOETI.mp4 587 Resistance https://www.khanacademy.org/science/ap-physics-2/x0e2f5a2c:electric-circuits/x0e2f5a2c:current-resistivity-ohms-law/e/voltage-and-ohm-s-law-ap1 2025-02-02T07:53:56.460765089Z Calculating resistance, voltage, and current using Ohm's law Practice using Ohm's law to predict changes in electric potential difference, resistance, or current for a circuit component.  April Russell exercise https://www.khanacademy.org/science/in-in-class10th-physics/in-in-electricity/in-in-circuits-ohms-law-resistance/v/solved-example-ohms-law 2020-06-23T07:22:41Z Solved example: Ohms law Let's solve a couple of numerical on Ohm's law.  Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/q8KaSRrlNDJFnxUUcQoz8GIHG7XMkbHqcnuSqJ4q4HmoHf2s3Zov5nph9Z03ii2dppyixl2SgXZWAulHGg4HcwM Solved example: Ohms law Let's solve a couple of numerical on Ohm's law.  https://cdn.kastatic.org/ka-youtube-converted/CSRqe676NAs.mp4/CSRqe676NAs.mp4 337 Resistance https://www.khanacademy.org/science/in-in-class-12th-physics-india/in-in-current-electricity/in-in-resistivity-and-ohms-law/a/resistance-and-resistivity-ap1 2021-04-29T07:59:27Z Current, resistance, and resistivity review Review the key terms, equations, and skills related to current, resistance, and resistivity, including how to find the current direction and what resistance depends on. article https://www.khanacademy.org/science/in-in-class10th-physics/in-in-electricity/in-in-circuits-ohms-law-resistance/e/ohm-s-law-and-resistance 2021-04-29T07:58:54Z Ohm's law and resistance Let's practice some problems to better understand Ohm's law. exercise https://www.khanacademy.org/science/in-in-class10th-physics/in-in-electricity/in-in-circuits-ohms-law-resistance/e/vi-graph-ohm-s-law 2026-04-08T00:36:09.500768563Z VI graph - Ohm's law Ohm's law graph Satrajit exercise https://www.khanacademy.org/science/ap-physics-2/x0e2f5a2c:electric-circuits/x0e2f5a2c:current-resistivity-ohms-law/e/simple-circuits-numerical-ap1 2026-04-15T05:40:45.550331962Z Ohm's law calculations Practice calculating potential difference, resistance, and current from a circuit diagram using Ohm's law. April Russell exercise https://www.khanacademy.org/science/ap-physics-2/x0e2f5a2c:electric-circuits/x0e2f5a2c:current-resistivity-ohms-law/v/resistivity-and-conductivity 2023-09-10T17:11:17.624018169Z Resistivity and conductivity Let's look at the properties of materials that cause a resistor to resist the flow of current. Explore the principles of Ohm's law, resistance, and resistivity in electrical circuits. Understand how resistance is defined by voltage and current, and how it remains constant in Ohmic materials. Discover the factors that influence resistance, including the length, cross-sectional area, and material of a resistor. David SantoPietro video https://cdn.kastatic.org/googleusercontent/-RlW8oVnlZWWOXxxRFGIP8eQTs9MZL5s5D8ukkvjimXnLYaLbIYOgBrIyt0QZKF69KItib1LU4Ie6iVJcPr2iA_B Resistivity and conductivity Let's look at the properties of materials that cause a resistor to resist the flow of current. Explore the principles of Ohm's law, resistance, and resistivity in electrical circuits. Understand how resistance is defined by voltage and current, and how it remains constant in Ohmic materials. Discover the factors that influence resistance, including the length, cross-sectional area, and material of a resistor. https://cdn.kastatic.org/ka-youtube-converted/4rsswT_Rv1M.mp4/4rsswT_Rv1M.mp4 722 Resistance https://www.khanacademy.org/science/physics/discoveries/resistance/v/pencil-resistor 2021-02-07T17:14:01Z Pencil resistor A pencil causes a change in the deflection, similar to the effect of adding an electromagnet. Why? Brit Cruise video https://cdn.kastatic.org/googleusercontent/PvYUFIfO38eYiYolx5YoNxjINJ_pPDRmoXmVbfTWGYvlx4trBCNe5l9wM3N9CYvF9_RU7OgZc2V026A6L6MUqeLz Pencil resistor A pencil causes a change in the deflection, similar to the effect of adding an electromagnet. Why? https://cdn.kastatic.org/ka-youtube-converted/Y8yga-UzFBY.mp4/Y8yga-UzFBY.mp4 64 Resistance https://www.khanacademy.org/science/physics/discoveries/resistance/v/variable-resistor-pencil 2021-02-07T17:14:00Z Variable resistor (pencil) We use the inside of a pencil (graphite) to apply different "lengths of pencil" to the circuit. What relationship do you observe between length of graphite and deflection angle? Brit Cruise video https://cdn.kastatic.org/googleusercontent/zVCr63AxA96n3qCEkGOXr14EDi4JaYGAHQA724t1SgwLCF5-cNn2kRO__IdqgQobgR8crqaS51SEzWcs_dI6w-w2 Variable resistor (pencil) We use the inside of a pencil (graphite) to apply different "lengths of pencil" to the circuit. What relationship do you observe between length of graphite and deflection angle? https://cdn.kastatic.org/ka-youtube-converted/EYlT-9KYPO0.mp4/EYlT-9KYPO0.mp4 88 Resistance https://www.khanacademy.org/science/physics/discoveries/resistance/v/listen-to-variable-resistance 2021-02-07T17:14:01Z Listen to variable resistance Here we draw a line on a page and use it as a variable resistor in series with a speaker. What relationship do we hear? Does it sound linear? Brit Cruise video https://cdn.kastatic.org/googleusercontent/k1srvJHSJ9OQUaSssvVIEl1aN_DYMdUk7yqWt5TL5mPVAEk8Gp4YiPbo53vl8FTG_2kPfoykyUtkgKMBq5gkjLea Listen to variable resistance Here we draw a line on a page and use it as a variable resistor in series with a speaker. What relationship do we hear? Does it sound linear? https://cdn.kastatic.org/ka-youtube-converted/LsvqEN3XVX4.mp4/LsvqEN3XVX4.mp4 71 Resistance