Electromagnetism Chapter Quiz

The amount of heat generated in a conductor is directly proportional to the square of the current flowing through it, the resistance of the conductor, and the time for which the current flows.

The unit of energy or work, often used to measure heat, is the Joule (J).

The flow of electric charge through a conductor, measured in Amperes (A).

The opposition to the flow of electric current, measured in Ohms (Ω).

The duration for which current flows, measured in seconds (s).

The formula used to calculate the heat generated in a conductor: H = I²Rt

Heat energy is often measured in calories (cal). One calorie is equal to 4.2 Joules.

The process of converting electrical energy into heat energy, often seen in devices like heaters, toasters, and electric kettles.

The unit of measurement for resistance, named after the German physicist Georg Simon Ohm.

The force that pushes electric current through a circuit.

A connection where multiple paths for electricity to flow exist.

The combined resistance in a parallel circuit is less than the lowest individual resistance.

The formula that relates voltage, current, and resistance.

A connection where all components share the same path for electricity to flow.

A lamp that uses a thin wire filament heated to incandescence to produce light. It is simple, inexpensive, but inefficient and short-lived.

A lamp that uses a gas discharge tube with mercury vapor to produce ultraviolet light that then excites a phosphor coating, creating visible light. It is energy-efficient and long-lasting but has a longer startup time and can contain mercury.

A lamp that uses a high-intensity electric arc between two electrodes to generate light. It is very bright and powerful, used for searchlights and projectors, but also inefficient, hot, and short-lived.

A compact fluorescent lamp that uses a coiled fluorescent tube to improve efficiency and compactness. It is more energy-efficient and lasts longer than a filament bulb but has a longer startup time and contains mercury.

A light-emitting diode that generates light when an electric current passes through it. It is highly energy-efficient, lasts very long, and can be dimmable, but is more expensive than other options.

The effect of electric current creating heat energy.

The unit of heat energy, often used in Joule's Law.

A device that converts electrical energy into sound energy.

The part of a loudspeaker that vibrates to produce sound.

A device that converts sound energy into electrical signals.

The force that pushes electric current through a circuit.

The power consumed by a device is directly proportional to the square of the current flowing through it. This relationship is a key principle for understanding how electrical devices operate.

Increasing the resistance in a circuit while maintaining the same voltage will decrease the power consumed. This is because resistance restricts current flow, reducing energy transfer.

To increase the power of a household heating device, increase its resistance. This can be achieved by using a material with higher resistivity or increasing the length of the heating element.

The amperage of a fuse is the maximum current it can safely handle before breaking the circuit. This protects connected devices from overloads.

To determine the correct fuse amperage for a circuit, use the formula I = P/V, where I is the current, P is the power of the device, and V is the voltage.

The amount of charge flowing through a circuit is directly proportional to the current and the time for which the current flows. This relationship helps determine the total charge transferred in a circuit.

The total resistance of resistors connected in series is the sum of their individual resistances. This is a fundamental rule for understanding how resistance combines in a circuit.

The process of converting electrical energy into other forms of energy, such as light, heat, or mechanical energy.

A device that converts light energy (solar energy) directly into electrical energy.

A device used to detect and measure electric current by observing the deflection of a needle.

A coil of wire wound into a cylindrical shape, often used to create a magnetic field or to convert electrical energy into mechanical energy.

The process of generating electricity by moving a conductor through a magnetic field.

An experiment conducted by Michael Faraday to demonstrate the principle of electromagnetic induction.

The direction of the force experienced by a conductor in a magnetic field depends on the direction of the current and the direction of the magnetic field.

A strong, permanent magnet that produces a consistent magnetic field.