Ohm's Law

Front

What is Ohm's Law?

Back

Ohm's Law states that the current (I) through a conductor between two points is directly proportional to the voltage (V) across the two points and inversely proportional to the resistance (R) of the conductor. It can be expressed as V = I × R.

Front

What is the unit of Voltage?

Back

The unit of Voltage is Volts (V).

Front

What is the unit of Current?

Back

The unit of Current is Amperes (A), commonly referred to as Amps.

Front

What is the unit of Resistance?

Back

The unit of Resistance is Ohms (Ω).

Front

What does the formula I × R represent?

Back

The formula I × R represents Voltage (V) according to Ohm's Law.

Front

If a circuit has a voltage of 12 Volts and a resistance of 3 Ohms, what is the current?

Back

The current (I) can be calculated using Ohm's Law: I = V / R = 12V / 3Ω = 4A.

Front

What is Resistance in electrical terms?

Back

Resistance is the ability of a material to reduce the flow of electric current, measured in Ohms (Ω).

Front

What happens to current if resistance increases while voltage remains constant?

Back

If resistance increases while voltage remains constant, the current decreases according to Ohm's Law.

Front

What is the relationship between Voltage, Current, and Resistance?

Back

The relationship is defined by Ohm's Law: V = I × R, meaning Voltage equals Current times Resistance.

Front

What size resistor is needed to achieve a current of 2 Amps with a 10 Volt battery?

Back

Using Ohm's Law: R = V / I = 10V / 2A = 5Ω.