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

What happens to the current in a circuit if the voltage is increased?

Back

The current would increase.

Front

What is the formula to find the current through a branch in a parallel circuit?

Back

I = V / R, where I is the current, V is the voltage, and R is the resistance.

Front

What does the symbol 'R' represent in electrical circuits?

Back

Resistance.

Front

How do you calculate total resistance in a series circuit?

Back

Add up all the resistances: R_total = R1 + R2 + R3 + ...

Front

How do you calculate total resistance in a parallel circuit?

Back

Use the inverse formula: 1/R_total = 1/R1 + 1/R2 + 1/R3 + ...

Front

If a circuit has a 4 ohm, 6 ohm, and 8 ohm resistor in parallel, what is the total resistance?

Back

1.846 ohms.

Front

What is the difference in calculating total resistance between series and parallel circuits?

Back

For series, add up resistances; for parallel, use the inverse equation.

Front

What is the unit of resistance?

Back

Ohm (Ω).

Front

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

Back

Voltage (V) = Current (I) × Resistance (R).