What is Ohm's Law? The exact definition please! This is for 7th grade science.
One ohm is the resistance value through which one volt will maintain a current of one ampere.
The current through a conductor between two points is directly proportional to the potential difference across the two points, and inversely proportional to the resistance between them.
WHAT IS FIRST
Ohm's Law is a fundamental principle in physics that describes the relationship between voltage, current, and resistance in an electrical circuit. It states that the current flowing through a conductor between two points is directly proportional to the voltage across the two points, and inversely proportional to the resistance.
To explain it mathematically, Ohm's Law can be represented by the equation:
I = V / R
Where:
- I represents the current flowing through the circuit, measured in Amperes (A).
- V represents the voltage across the two points of the circuit, measured in Volts (V).
- R represents the resistance of the circuit, measured in Ohms (Ω).
To understand Ohm's Law, you need to know how to calculate current, voltage, and resistance. Here's a breakdown of each component:
1. Current (I): Current is the flow of electric charge in a circuit. It is measured in Amperes (A) using a device called an ammeter. Current is calculated by dividing the voltage (V) by the resistance (R), as shown in the formula I = V / R.
2. Voltage (V): Voltage is the electrical potential difference between two points in a circuit. It is measured in Volts (V) using a voltmeter. Voltage can be calculated by multiplying the current (I) by the resistance (R), as shown in the formula V = I * R.
3. Resistance (R): Resistance is the opposition to the flow of electric current in a circuit. It is measured in Ohms (Ω) using an ohmmeter. Resistance can be calculated by dividing the voltage (V) by the current (I), as shown in the formula R = V / I.
By using Ohm's Law and these formulas, you can calculate any one of the three components (current, voltage, or resistance) if you know the values of the other two.