2nd 9 Weeks Review

Front

What is a circuit breaker?

Back

A circuit breaker is a safety device that automatically stops the flow of electricity in a circuit when it detects an overload or short circuit, preventing overheating and potential fires.

Front

How does a surge protector work?

Back

A surge protector is a device that shields electrical devices from voltage spikes by diverting excess voltage to the ground, protecting sensitive electronics.

Front

What is the formula to calculate voltage in a circuit?

Back

Voltage (V) = Current (I) x Resistance (R) where V is voltage in volts, I is current in amps, and R is resistance in ohms.

Front

Which circuit has the highest voltage: 20 amps & 16 ohms, 10 amps & 10 ohms, 25 amps & 16 ohms, or 20 amps & 10 ohms?

Back

The circuit with 25 amps and 16 ohms has the highest voltage.

Front

What is an electrical field?

Back

An electrical field is a region around a charged particle where it exerts a force on other charged particles, causing them to move.

Front

What is thermal energy transfer by radiation?

Back

Thermal energy transfer by radiation occurs when heat is transferred through electromagnetic waves, such as sunlight warming a solar panel.

Front

What is conduction in terms of thermal energy transfer?

Back

Conduction is the process of heat transfer through direct contact between materials, where energy is passed from one molecule to another.

Front

What is convection?

Back

Convection is the transfer of heat through the movement of fluids (liquids or gases) caused by differences in temperature and density.

Front

How can the strength of an electromagnet be increased?

Back

The strength of an electromagnet can be increased by increasing the number of coils of wire and the amount of electric current flowing through it.

Front

What is the role of insulators in electrical systems?

Back

Insulators are materials that do not conduct electricity well, preventing the flow of electric current and protecting users from electric shock.