Current, potential difference and energy flow
Physics · Unit 1 — Thermal, nuclear and electrical physics · Electrical circuits
Learning objectives (23)
LO-1Compare characteristics of ohmic and non-ohmic resistors experimentally.LO-2Construct electrical circuit diagrams using the following symbolsLO-3Describe electric charge as positive or negative.LO-4Describe electric current as carried by discrete electric charge carriers.LO-5Describe series and parallel connections of components in electrical circuits.LO-6Describe simple series, parallel and series/parallel circuits.LO-7Describe the concept of power dissipation over resistors in a circuit.LO-8Describe the concept of resistance.LO-9Describe the concepts of electrical potential difference and power within a circuit.LO-10Describe the law of conservation of electric charge.LO-11Discuss the differences between ohmic and non-ohmic resistors.LO-12Explain in qualitative terms why electric charge separation produces an electrical potential difference.LO-13Explain that electric charge is conserved at all points in an electrical circuit.LO-14Explain that the energy available to electric charges moving in an electrical circuit is measured using electrical potential difference.LO-15Explain that the energy inputs in a circuit equal the sum of energy output from loads in the circuit.LO-16Interpret experimental data to determine the resistance across an ohmic resistor. Circuit analysis and designLO-17Interpret graphical representations of electrical potential difference versus electric current data to find resistance using the gradient and its uncertainty.LO-18Solve problems involving electric current, electric charge and time using 𝐼 = 𝑞 𝑡.LO-19Solve problems involving electrical potential difference using 𝑉 = 𝑊 𝑞.LO-20Solve problems involving electrical potential difference, electric current, resistance and power.LO-21Solve problems involving finding equivalent resistance, electrical potential difference and electric currents in series and parallel circuits using 𝑃 = 𝑉𝐼, 𝑃 = 𝐼2 𝑅, 𝑉𝑡 = 𝑉1 + 𝑉2 + ⋯ 𝑉𝑛, 𝑅𝑡 = 𝑅1 + 𝑅2 + ⋯ 𝑅𝑛, 𝐼𝑡 = 𝐼1 + 𝐼2 + ⋯ 𝐼𝑛, 1 𝑅𝑡 = 1 𝑅1 + 1 𝑅2 + ⋯ 1 𝑅𝑛.LO-22Solve problems involving power using 𝑃 = 𝑊 𝑡.LO-23Solve problems using 𝑉 = 𝐼𝑅.
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