15.3Q) 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 is commonly expressed as V = I × R.

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 the voltage in volts and I is the current in amperes.

Front

What is the unit of resistance?

Back

The unit of resistance is the Ohm (Ω).

Front

What is the relationship between voltage, current, and resistance in a series circuit?

Back

In a series circuit, the total voltage is the sum of the individual voltages across each component, the current is the same through all components, and the total resistance is the sum of the individual resistances.

Front

What is the relationship between voltage, current, and resistance in a parallel circuit?

Back

In a parallel circuit, the total voltage across each component is the same, the total current is the sum of the currents through each component, and the total resistance can be calculated using the formula 1/R_total = 1/R1 + 1/R2 + ... + 1/Rn.

Front

What happens to the current in a circuit if the resistance is increased while the voltage remains constant?

Back

If the resistance is increased while the voltage remains constant, the current will decrease according to Ohm's Law (I = V / R).

Front

What is the formula to calculate power in an electrical circuit?

Back

Power (P) can be calculated using the formula P = V × I, where P is power in watts, V is voltage in volts, and I is current in amperes.

Front

How do you find the total current in a parallel circuit with multiple resistors?

Back

To find the total current in a parallel circuit, first calculate the total resistance using the formula 1/R_total = 1/R1 + 1/R2 + ... + 1/Rn, then use Ohm's Law (I_total = V / R_total) to find the total current.

Front

What is a short circuit?

Back

A short circuit occurs when there is a low-resistance connection between two points in an electric circuit, allowing a large amount of current to flow, which can cause overheating and damage.

Front

What is the effect of adding more resistors in series on the total resistance?

Back

Adding more resistors in series increases the total resistance, as the total resistance is the sum of the individual resistances.