Current And Voltage In Circuits
Muhtasari
Every electronic device you use relies on electric current flowing through a circuit. Understanding how current and voltage behave in different circuit arrangements is essential for predicting how components work together.
In this lesson you will learn what current and voltage really measure, how to use Ohm's law to calculate resistance, and how current and voltage distribute themselves in series circuits. You will also explore I-V characteristics for resistors, filament lamps and diodes - a favourite topic on Edexcel papers.
Malengo
- Understand how the current in a series circuit depends on the applied voltage and the number and nature of other components
- Describe how current varies with voltage in wires, resistors and metal filament lamps, and how to investigate this experimentally
- Describe the qualitative effect of changing resistance on the current in a circuit
- Know that lamps and LEDs can be used to indicate the presence of a current in a circuit
- Know and use the relationship between voltage, current and resistance: V = I x R
- Know that current is the rate of flow of charge
- Know that electric current in solid metallic conductors is a flow of negatively charged electrons
- Calculate the currents, voltages and resistances of two resistive components connected in a series circuit
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- Electric current in a metal wire is a flow of: A) Protons B) Neutrons C) Electrons D) Ions Answer: C
- An ammeter should be connected: A) In parallel with the component B) In series with the component C) Across the battery D) It does not matter Answer: B
- Two resistors of 6 ohms and 4 ohms are connected in series. What is the total resistance? A) 2.4 ohms B) 10 ohms C) 24 ohms D) 1.5 ohms Answer: B
- The I-V graph for an ohmic conductor is: A) A curve through the origin B) A straight line through the origin C) A horizontal line D) A line that starts at 0.7 V Answer: B
- In a series circuit, the current: A) Is largest near the battery B) Splits between components C) Is the same at all points D) Depends on the voltmeter reading Answer: C
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Vitabu Vinavyopendekezwa
Jifunze zaidi kutoka vyanzo huria
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Sehemu ya kitabu
Ohm's law
Describe how current is related to charge and time, and distinguish between direct current and alternating current
"Physics: Ohm's law" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/physics/pages/19-1-ohms-law. Access for free at https://openstax.org/books/physics/pages/1-introduction
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Sehemu ya kitabu
Series Circuits
Interpret circuit diagrams and diagram basic circuit elements
"Physics: Series Circuits" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/physics/pages/19-2-series-circuits. Access for free at https://openstax.org/books/physics/pages/1-introduction
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