Ohm's Law and Circuits

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What is Ohm's Law?

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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 does V stand for in electrical circuits?

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V stands for Voltage, which is the electric potential difference between two points.

Front

What is the formula to calculate current in a circuit?

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

Front

What happens to the 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 + ...

Front

What happens to the total resistance in a parallel circuit?

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

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How does adding more resistors in series affect the total resistance?

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Adding more resistors in series increases the total resistance.

Front

How does adding more resistors in parallel affect the total resistance?

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Adding more resistors in parallel decreases the total resistance.

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What is the effect of increasing voltage on current in a series circuit?

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Increasing the voltage in a series circuit increases the current, provided the resistance remains constant.

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What is the effect of rearranging a series circuit into a parallel circuit on bulb brightness?

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Rearranging a series circuit into a parallel circuit increases the brightness of the bulbs because each bulb receives the full voltage.

Front

What is the unit of resistance?

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The unit of resistance is Ohm (Ω).