Ch 11 - Electricity10th Science
Electric Current: Definition & Composition
What fundamentally constitutes an electric current in a metallic conductor, and how is its magnitude mathematically defined?
What fundamentally constitutes an electric current in a metallic conductor, and how is its magnitude mathematically defined?
- The Constituent: In metallic wires, electric current is constituted by the continuous, directional flow of free electrons (negative charges).
- The Definition: The magnitude of electric current is expressed as the rate of flow of electric charges. It is the exact amount of charge flowing through a particular cross-sectional area of a conductor in unit time.
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Formula for Electric Current
Formula for Electric Current
State the formula relating electric current, net charge, and time.
Variables & Units:
- I = Electric current (Ampere, A)
- Q = Net charge (Coulomb, C)
- t = Time (second, s)
Conditions/Notes:
- Current is measured using an ammeter connected in series.
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**I** **Q**uit **t**hinking (I = Q/t)
The Ampere, Charge & Sub-Units
Define 1 Ampere and its standard sub-units (milliampere, microampere). Approximately how many electrons constitute exactly one Coulomb of net charge?
Define 1 Ampere and its standard sub-units (milliampere, microampere). Approximately how many electrons constitute exactly one Coulomb of net charge?
- 1 Ampere (A): The continuous flow of exactly one Coulomb of charge per second ().
- Sub-units: and .
- Electron Charge: A single electron carries a tiny negative charge of .
- Coulomb Composition: By mathematically dividing by the charge of a single electron, we determine that approximately electrons are required to constitute 1 Coulomb of net charge.
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Also in this chapter
36 more cards to study in Prism
- 4Conventional vs. Actual Current Direction
- 5Misconception: Consumption of Electrons
- 6Potential Difference Formula
- 7Electric Potential Difference
- 8Defining 1 Volt
- 9Ohm's Law Equation
- 10Ammeter vs. Voltmeter Connections
- 11Ohm's Law
- 12Formula for Resistance & Resistivity
- 13Interpreting the V-I Graph
- 14Defining Resistance and 1 Ohm
- 15Equivalent Resistance in Series
- 16The Atomic Origin of Resistance
- 17Factors Affecting Resistance
- 18Equivalent Resistance in Parallel
- 19Advantages of Parallel Circuits
- 20Resistance vs. Resistivity
- 21Variable Resistance (Rheostat)
- 22Joule's Heating Formula
- 23Wire Stretching (Volume Constancy)
- 24Cutting a Wire into Parts
- 25Resistors in Series (Characteristics)
- 26Formulas for Electric Power
- 27Resistors in Parallel (Characteristics)
- 28V-I Graph: Series vs. Parallel Circuits
- 29Conversion: kWh to Joules
- 30Joule's Law of Heating (Dependencies)
- 31Electrical Energy Consumption
- 32Heating Element vs. Copper Connecting Cord
- 33Alloys in Electrical Heating Elements
- 34Physics of the Incandescent Bulb
- 35The Electric Fuse Mechanism
- 36Electric Power & The Watt
- 37Milliampere & Microampere
- 38Macro-Scale Units of Electrical Power
- 39Commercial Unit of Electrical Energy
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