Ohm's Law & Circuits Math Edited

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 formula for calculating power in an electrical circuit?

Back

Power (P) in an electrical circuit can be calculated using the formula P = V × I, where V is the voltage and I is the current.

Front

How do you calculate the total resistance in a parallel circuit?

Back

In a parallel circuit, the total resistance (R_total) can be calculated using the formula 1/R_total = 1/R1 + 1/R2 + 1/R3 + ... for all resistors in parallel.

Front

What is the unit of electrical resistance?

Back

The unit of electrical resistance is the Ohm (Ω).

Front

If the voltage across a resistor is 12V and the resistance is 4Ω, what is the current through the resistor?

Back

Using Ohm's Law, I = V/R, the current is I = 12V / 4Ω = 3A.

Front

What happens to the total current in a parallel circuit when more resistors are added?

Back

In a parallel circuit, the total current increases as more resistors are added because each additional resistor provides an alternative path for the current.

Front

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

Back

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

Front

How do you find the voltage drop across a resistor in a parallel circuit?

Back

In a parallel circuit, the voltage drop across each resistor is the same and equal to the source voltage.

Front

What is the power consumed by a circuit with a resistance of 20Ω and a current of 5A?

Back

Using the power formula P = I² × R, the power consumed is P = 5A² × 20Ω = 500W.

Front

What is the equivalent resistance of three 30Ω resistors in parallel?

Back

Using the formula 1/R_total = 1/30 + 1/30 + 1/30, the equivalent resistance is R_total = 10Ω.