Ohm's Law and Circuits

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

How do you calculate total resistance in a series circuit?

Back

In a series circuit, the total resistance (R_total) is the sum of all individual resistances: R_total = R1 + R2 + R3 + ... + Rn.

Front

How do you calculate 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 + ... + 1/Rn.

Front

What is the formula for calculating power in a circuit?

Back

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

Front

What does voltage represent in a circuit?

Back

Voltage (V) represents the potential difference between two points in a circuit, which drives the flow of current.

Front

What is the unit of resistance?

Back

The unit of resistance is the Ohm (Ω).

Front

What is the unit of voltage?

Back

The unit of voltage is the Volt (V).

Front

What is the unit of current?

Back

The unit of current is the Ampere (A).

Front

If a circuit has a voltage of 200V and a resistance of 40Ω, what is the current?

Back

Using Ohm's Law, I = V/R = 200V / 40Ω = 5A.

Front

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

Back

The relationship is defined by Ohm's Law: V = I × R.