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Ohm's law for science students
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64 days agoWhat is Ohm’s Law?
Definition:
Ohm’s Law states that the current flowing through a conductor between two points is directly proportional to the voltage across it, provided the temperature and other physical conditions remain constant.
Explanation:
This law shows the simple relationship between voltage (V), current (I), and resistance (R). If you increase the voltage across a conductor, the current increases. If resistance increases, current decreases. It is the foundation of electrical circuits and electronics.
Imagine:
Think of water flowing through a pipe. The voltage is like water pressure, the current is the flow of water, and the resistance is like the pipe’s narrowness. Higher pressure = more flow, narrower pipe = less flow.
In simple terms:
Ohm’s Law says current = voltage ÷ resistance.
Formula:
V = I × R
Where:
• V = voltage (volts)
• I = current (amperes)
• R = resistance (ohms, Ω)
Key Points:
• Current increases with voltage.
• Current decreases with resistance.
• Linear relationship holds for “ohmic” conductors (like metals).
• Not valid for devices like diodes or transistors (non-ohmic).
Examples:
• A 12 V battery connected to a 6 Ω resistor → I = 2 A.
• Electric heaters and light bulbs use Ohm’s Law in design.
• Electronics calculations for safe current levels.
Applications / Relevance:
• ⚡ Circuit design.
• 🔋 Battery and power supply systems.
• 💡 Household appliances.
• 🏭 Industrial electronics.
• 📚 Physics education.
Question:
Does Ohm’s Law apply to all materials?
Answer:
No, it only applies to ohmic conductors (with constant resistance). Non-linear devices (like diodes, semiconductors) do not strictly obey Ohm’s Law.
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