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KembaraXtra-Computer Science-Ohm's Law
1. Ohm's Law Explained
1. Ohm's Law Explained
- Definition: Defines the relationship between current (I), voltage (V), and resistance (R) in a circuit.
- Formula: I = V / R
- I: Current (measured in Amperes or Amps)
- V: Voltage (measured in Volts)
- R: Resistance (measured in Ohms Ω)
- Concept: The current flowing between two points is directly proportional to the voltage across those points and inversely proportional to the resistance between them.
- Example: A 9V battery connected to a 10,000Ω resistor.
- I = 9V / 10,000Ω = 0.0009 Amps = 0.9 mA (milliamps)
- Key Takeaway: You can calculate any one of the three values (I, V, or R) if you know the other two.
- AC (Alternating Current):
- Electric current that periodically reverses direction.
- Used for transmitting electricity over long distances (power grids).
- Powers appliances plugged directly into wall sockets (without an adapter).
- DC (Direct Current):
- Electric current that flows in one direction only.
- Provided by batteries.
- Used by most smaller electronics (laptops, smartphones).
- Often requires AC to DC conversion using an adapter.
- AC/DC Voltage: The terms apply to voltage sources, meaning "alternating voltage" or "direct voltage" respectively.
- Focus: This text primarily focuses on DC circuits.
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