SECOND QUARTER EXAMINATION IN STE 10-ELECTRONICS

The students observed that a higher battery output makes the bulb brighter. Which quantity represents the energy difference that pushes electric charges through the wire?

• current

• power

• resistance

• voltage

To move charges through their circuit, the students realized that work must be done against the electric field. Which quantity represents the work done per unit of charge?

• Charge

• Energy

• Resistance

• Time

When the solar panel is connected, charges flow continuously through the copper wires to the bulb. Which quantity measures the rate at which charges flow through the wire?

• Resistance

• Current

• Energy

• Voltage

If an electric circuit is compared to a water tank with a pipe at the bottom, which part of the water system is most similar to the voltage in the circuit?

• A. The water level in the tank

• B. The water flowing through the pipe

• C. The pressure at the bottom of the tank

• D. The pump that moves water into the tank

The team calculated how much charge flowed through the circuit in a given time. Which formula can they use to determine the current?

• A. I = Q / t

• B. P = V x I

• C. R = V / I

• D. V = I x R

After testing different wires in their circuit, the students observed that thinner wires became warmer after several minutes of use. They discussed which property of the wire causes this effect by opposing the flow of electric current. Which quantity describes the property of a wire that opposes the flow of current?

• Energy

• Power

• Resistance

• Voltage

During a science fair, students compared two wires made of the same material and length but with different thicknesses. They observed that the thinner wire heated up faster when connected to a battery. Based on their observation, which factor affects the resistance of a conductor besides its material, length, and temperature?

• A. Color

• B. Connection type

• C. Cross-sectional area

• D. Shape

According to Ohm’s Law, how is current related to voltage?

• Directly proportional

• Equal

• Inversely proportional

• Unrelated

To summarize their findings, the students used an equation to express the relationship between voltage, current, and resistance. Which equation represents Ohm’s Law?

• I = Q / t

• P = V × I

• R = V / I

• V = I × R

Gemma is at home on a rainy afternoon. She notices her family using different electrical appliances: a lamp, a fan, and a rice cooker. She sees that the lamp sometimes gets dimmer when other devices are on, and the fan slows down during a storm. Curious, Maria wonders how the voltage, current, and resistance in the circuits affect how these appliances work. Gemma wants to understand why a small lamp gets dimmer when too many devices are plugged into the same socket. She knows the lamp’s resistance stays the same.

• The power supply reduces resistance automatically.

• The current through the lamp increases regardless of voltage.

• The lamp’s resistance increases when other devices are used.

• The voltage across the lamp decreases when many devices are plugged in.