Electronics and Inventions Challenge

What is Ohm's Law formula?

• V = R / I

• I = V + R

• V = I * R

• R = V - I

Answer explanation

Ohm's Law states that voltage (V) is equal to the current (I) multiplied by the resistance (R). Therefore, the correct formula is V = I * R, which shows the relationship between these three electrical quantities.

What is the unit of resistance?

• Ohm

• Watt

• Ampere

• Volt

Answer explanation

The unit of resistance is the Ohm, symbolized by the Greek letter Omega (Ω). It measures how much a material opposes the flow of electric current. The other options (Watt, Ampere, Volt) represent power, current, and voltage, respectively.

In a DC circuit, what remains constant?

• Power remains constant.

• Voltage remains constant.

• Current remains constant.

• Resistance remains constant.

Answer explanation

In a DC circuit, current remains constant throughout the circuit. This is due to the nature of direct current, where the flow of electric charge does not change over time, unlike voltage or power which can vary.

What does AC stand for?

• Analog Current

• Active Current

• Alternating Current

• Alternating Circuit

Answer explanation

AC stands for Alternating Current, which is a type of electrical current that reverses direction periodically, unlike Direct Current (DC) that flows in one direction. This makes 'Alternating Current' the correct choice.

What is the primary difference between AC and DC?

• AC is more efficient for long-distance transmission than DC.

• DC changes direction periodically, while AC flows in one direction.

• The primary difference between AC and DC is that AC changes direction periodically, whereas DC flows in one direction.

• AC is used in batteries, while DC is used in power lines.

Answer explanation

The correct choice highlights that AC (Alternating Current) changes direction periodically, while DC (Direct Current) flows in one direction. This fundamental difference affects their applications in power transmission and usage.

What is the function of a resistor in a circuit?

• To convert electrical energy into heat.

• To store electrical energy for later use.

• To increase current flow in a circuit.

• To limit current and control voltage in a circuit.

Answer explanation

A resistor limits current and controls voltage in a circuit by providing resistance. This prevents excessive current flow, protecting components and ensuring proper operation.

What is the basic building block of digital electronics?

• Transistor

• Capacitor

• Resistor

• Diode

Answer explanation

The transistor is the fundamental building block of digital electronics, acting as a switch or amplifier. It enables the creation of logic gates and circuits, making it essential for modern computing and electronic devices.

What does a capacitor do in a circuit?

• A capacitor stores and releases electrical energy in a circuit.

• A capacitor amplifies electrical signals in a circuit.

• A capacitor acts as a fuse to protect the circuit.

• A capacitor converts electrical energy into heat.

Answer explanation

A capacitor stores and releases electrical energy in a circuit, allowing it to smooth out voltage fluctuations and provide power when needed. This function is essential for maintaining stable operation in electronic devices.

What is the purpose of a diode?

• To amplify electrical signals without distortion.

• The purpose of a diode is to allow current to flow in one direction while blocking it in the opposite direction.

• To store electrical energy for later use.

• To allow current to flow in both directions equally.

Answer explanation

The correct choice explains that a diode allows current to flow in one direction while blocking it in the opposite direction, which is its primary function in electronic circuits.

What is the voltage level of a standard AA battery?

• 3 volts

• 1.2 volts

• 1.5 volts

• 9 volts

Answer explanation

A standard AA battery typically has a voltage level of 1.5 volts. This is the most common voltage for alkaline AA batteries, making it the correct choice among the options provided.