FLASHCARD-1

Front

What is the role of dielectrics?

Back

Dielectrics are insulators that store and manage electrical energy when exposed to an electric field. They do not conduct electricity like conductors do. Instead, they polarize, aligning their internal electric dipoles in response to the field. This polarization reduces the electric field within the dielectric, enhancing the capacitor’s ability to store charge. They are used in capacitors, transformers, and various electronic devices to ensure they function efficiently.

Front

What is the formula for capacitance?

Back

C = Q/V

Front

What is the unit of capacitance?

Back

Farad

Front

It is the flow of positive charge from the positive to the negative terminal.

Back

conventional current

Front

What is the effect of temperature on the resistance of a metallic conductor?

Back

As the temperature increases, the resistance also increases.

Front

Instrument used to measure current.

Back

Ammeter

Front

What is a resistor?

Back

A resistor is an electrical component designed to limit or regulate the flow of electrical current in a circuit. Think of it as a traffic controller for electrons, ensuring they don't rush through too quickly.

Front

What is capacitance?

Back

Capacitance is a measure of a capacitor's ability to store electrical charge. It is determined by how much charge is stored per unit voltage applied across its plates, and it is measured in farads (F).

Factors affecting capacitance include:

• Surface Area: Larger plates store more charge.

• Distance Between Plates: Closer plates increase capacitance.

• Dielectric Material: The type of insulating material between the plates also plays a role.

Front

Permittivity constant

Back

The permittivity constant, also known as the vacuum permittivity or the electric constant, is a fundamental physical constant denoted by ε₀. It is a measure of how much resistance the vacuum offers to the formation of an electric field. The value of ε₀ is approximately 8.854 x 10⁻¹² F/m (farads per meter).

Front

Parallel-Plate Capacitor

Back

A parallel-plate capacitor is the most common type of capacitor that consists of two parallel conductive plates separated by an insulating material called the dielectric.