Inductance and Inductive Effects

The video tutorial explores the behavior of a simple circuit with a battery, bulb, and switch. It introduces a coil in series, demonstrating the concept of inductance and its effect on current flow. The tutorial explains self-inductance, likening it to electrical inertia, and uses Faraday's Law to calculate inductance. A practical experiment illustrates how inductors resist changes in current, highlighting their role in maintaining steady currents and the potential dangers of high voltage sparks when circuits are opened.

What happens to the bulb when the switch is closed in the initial circuit without the coil?

• The bulb glows after a delay.

• The bulb glows immediately.

• The bulb does not glow.

• The bulb flickers.

Why does the bulb take time to reach full brightness when a coil is added in series?

• The coil increases the resistance.

• The coil delays the current reaching its maximum value.

• The coil decreases the voltage.

• The coil absorbs the current.

What is the role of the induced emf in the coil?

• It decreases the resistance.

• It opposes the change in current.

• It increases the voltage.

• It supports the change in current.

What is self-inductance?

• The coil's ability to decrease resistance.

• The coil's ability to support current changes.

• The coil's ability to increase voltage.

• The coil's ability to oppose changes in its own current.

How is the induced emf related to the rate of change of current?

• It is not related.

• It is exponentially related.

• It is inversely proportional.

• It is directly proportional.

What unit is used to measure inductance?

• Henry

• Volt

• Ohm

• Ampere

What does a high inductance value indicate?

• High resistance to current changes.

• Increased voltage.

• No effect on current changes.

• Low resistance to current changes.

What happens when the switch is opened in a circuit with an inductor?

• The inductor increases the resistance.

• The inductor stops the current immediately.

• The inductor maintains the current, causing a spark.

• The inductor decreases the voltage.

Why is it dangerous to switch off circuits with large inductors?

• They can generate high voltage sparks.

• They can decrease the current.

• They can overheat the circuit.

• They can cause a short circuit.

What is one application of inductors mentioned in the video?

• To increase voltage in a circuit.

• To maintain a steady current.

• To support current changes.

• To decrease resistance.