DQ: Ohm's Laws

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 current?

Back

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

Front

How do you calculate current using Ohm's Law?

Back

Current (I) can be calculated using the formula I = V / R, where V is voltage and R is resistance.

Front

If a circuit has a voltage of 24 volts and a resistance of 8 ohms, what is the current?

Back

The current is 3 Amps, calculated using I = V / R = 24V / 8Ω.

Front

What is the unit of resistance?

Back

The unit of resistance is Ohms (Ω).

Front

How do you calculate resistance using Ohm's Law?

Back

Resistance (R) can be calculated using the formula R = V / I, where V is voltage and I is current.

Front

If a circuit has a voltage of 14.5 volts and a resistance of 6 ohms, what is the current?

Back

The current is 2.41 Amps, calculated using I = V / R = 14.5V / 6Ω.

Front

What is the relationship between voltage, current, and resistance?

Back

The relationship is defined by Ohm's Law: V = I × R, meaning voltage is the product of current and resistance.

Front

What size resistor would produce a 3 Amp current flow with a 12 Volt battery?

Back

A 4 Ohm resistor is needed, calculated using R = V / I = 12V / 3A.

Front

What is voltage measured in?

Back

Voltage is measured in Volts (V).