Calculate electrical current (Amperes) using Ohm's Law: I = V / R. Essential for electronics, circuit design, and electrical engineering.
⚡ Ohm's Law: I = V / R
Where I = Current (Amperes/A), V = Voltage (Volts/V), R = Resistance (Ohms/Ω)
📊 Calculated Current
0 A
💡 Power (P = V × I)
0 W
I = V ÷ R = 220V ÷ 10Ω = 22 A
📖 What is Electric Current?
Electric current is the flow of electric charge in a circuit. It is measured in Amperes (Amps/A). Current represents how many electrons are flowing through a conductor per second. One Ampere equals one Coulomb of charge passing a point per second.
📐 Ohm's Law Formula for Current
I = V ÷ R
I = Current (Amperes/A) | V = Voltage (Volts/V) | R = Resistance (Ohms/Ω)
Example 1: V = 220V, R = 10Ω → I = 220 ÷ 10 = 22A Example 2: V = 12V, R = 6Ω → I = 12 ÷ 6 = 2A
📊 Common Current Values
Device
Voltage
Resistance
Current
LED Light
5V DC
100-300 Ω
20-50 mA
USB Charger
5V DC
2.5-5 Ω
1-2A
Laptop Charger
19V DC
2-4 Ω
3-5A
Electric Iron
220V AC
40-55 Ω
4-5.5A
Household Outlet
220V AC
22 Ω
10A
📝 Frequently Asked Questions
❓ What is the formula for calculating current? ▼
The formula is I = V ÷ R (Current = Voltage divided by Resistance). This is Ohm's Law. For example, if voltage is 220V and resistance is 10Ω, current = 220 ÷ 10 = 22 Amperes.
❓ What is the difference between AC and DC current? ▼
AC (Alternating Current) changes direction periodically (household electricity, 50/60Hz). DC (Direct Current) flows in one direction (batteries, USB power). Ohm's Law applies to both.
❓ How many amps does a typical household outlet provide? ▼
In India, standard household circuits are rated for 10-16 Amperes at 220V. For example, a 10A circuit can handle up to 2200W (10A × 220V = 2200W).
❓ How do I calculate current if I know power and voltage? ▼
You can use the power formula: I = P ÷ V. For example, if a device uses 100W at 220V, current = 100 ÷ 220 = 0.45 Amperes (450mA).
💡 Educational Note: Current is measured in Amperes (Amps/A), named after French physicist André-Marie Ampère (1775-1836). One Ampere equals one Coulomb (6.24 × 10¹⁸ electrons) flowing per second.