Electricity: 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 resistance measured in?

Back

Resistance is measured in Ohms (Ω).

Front

What is current measured in?

Back

Current is measured in Amperes (A).

Front

What is voltage?

Back

Voltage is the electrical pressure that pushes electrons through a circuit, measured in Volts (V).

Front

What factors affect resistance?

Back

Resistance is affected by the type of material, length of the material, and cross-sectional area of the material. Mass does not affect resistance.

Front

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

Back

According to Ohm's Law, the relationship is defined as V = I × R, where V is voltage, I is current, and R is resistance.

Front

If a circuit has a resistance of 2 Ohms and a current of 3 Amps, what is the voltage?

Back

Using Ohm's Law: V = I × R = 3 A × 2 Ω = 6 Volts.

Front

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

Back

If resistance increases while voltage remains constant, the current will decrease.

Front

What is the formula to calculate resistance?

Back

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

Front

What is the unit of measurement for voltage?

Back

The unit of measurement for voltage is Volts (V).