Electricity Basics

What is the SI unit of electric current?

• B

• A

• C

• D

What is the formula to calculate electrical power?

• Power (P) = V / I

• Power (P) = V x I

• Power (P) = V + I

• Power (P) = V - I

What is the unit of electrical resistance?

• Volt

• Joule

• Ohm

• Ampere

What is Ohm's Law?

• Ohm's Law is E = mc^2, where E is energy, m is mass, and c is the speed of light.

• Ohm's Law is F = m * a, where F is the force, m is the mass, and a is the acceleration.

• Ohm's Law is P = V * I, where P is the power, V is the voltage, and I is the current.

• Ohm's Law is V = I * R, where V is the voltage, I is the current, and R is the resistance.

What is the difference between AC and DC?

• AC flows in one direction only

• DC reverses direction periodically

• AC flows faster than DC

• The main difference is the direction of the flow of electric charge: AC reverses direction periodically, while DC flows in one direction only.

What is an electric circuit?

• An electric circuit is an open loop through which an electric current can flow.

• An electric circuit is a closed loop through which an electric current can flow.

• An electric circuit is a type of battery used to store electricity.

• An electric circuit is a device that converts mechanical energy into electrical energy.

What is the purpose of a circuit breaker?

• To play music when the circuit is active

• To interrupt the flow of electricity in case of an overload or short circuit

• To regulate the temperature of the circuit

• To increase the speed of electricity flow

What is the role of a transformer in electricity?

• Transformers are used to store electricity

• Transformers are only used in DC circuits

• The role of a transformer in electricity is to change the voltage level of an AC electrical signal.

• The role of a transformer is to generate electricity

What are conductors and insulators?

• Conductors are materials that block the flow of electricity

• Conductors are materials that absorb electricity

• Insulators are materials that enhance the flow of electricity

• Conductors are materials that allow the flow of electricity, while insulators are materials that do not allow the flow of electricity.

Explain the concept of electric potential difference.

• Electric potential difference is the work done per unit charge in moving a positive test charge between two points in an electric field.

• Electric potential difference is the rate at which electric energy is consumed in a circuit.

• Electric potential difference is the resistance of a material to the flow of electric current.

• Electric potential difference is the force experienced by a charge in an electric field.