UAS Applied English for Science

Which of the following best defines electric current?

• The amount of energy stored in a battery

• The resistance a material offers to the flow of charge

• The rate at which electric charge flows through a conductor

• The amount of potential energy per unit charge

• The total voltage of a closed circuit

What unit is used to measure potential difference in an electric circuit?

• Ohm

• Ampere

• Watt

• Volt

• Coulomb

What happens to the current if the resistance in a circuit increases, assuming the voltage remains constant?

• The current increases

• The current remains the same

• The current decreases

• The current stops completely

• The voltage also increases

A student builds a simple circuit with a 12 V battery and two resistors: one 4-ohm and one 2-ohm connected in series. What is the total current flowing in the circuit?

• 1 A

• 2 A

• 3 A

• 4 A

• 6 A

What does Kirchhoff’s Current Law (KCL) state?

• The total current in a branch equals the total resistance in that branch

• The sum of currents entering a junction equals the sum of currents leaving it

• The total voltage in a closed loop is zero

• The total power in a circuit equals the sum of voltage and current

• Current always flows from high to low resistance

Which of the following best describes Kirchhoff’s Voltage Law (KVL)?

• The total voltage around a closed loop is equal to the total current

• Voltage is equally divided among all resistors

• The algebraic sum of all voltages in a closed loop equals zero

• The voltage drop across a resistor is always negative

• The voltage at a junction is always constant

At a junction in an electric circuit, three wires meet. Two currents of 3 A and 2 A are entering the junction, while one current is leaving the junction. According to Kirchhoff’s Current Law, what is the value of the current leaving the junction?

• 6 A

• 3 A

• 5 A

• 1 A

• 2 A

A circuit has a junction where three wires meet. Current I₁ = 4 A flows into the junction, and currents I₂ = 2.5 A and I₃ flow out. According to KCL, what is the value of I₃?

• 1.5 A

• 2.5 A

• 4 A

• 6.5 A

• 7 A

Which of the following is a correct definition of a wave?

• A steady flow of electric charge

• A sudden burst of energy that disappears instantly

• A disturbance that transfers energy from one place to another

• A stream of particles that carry force

• A chemical reaction spreading in a medium

What type of wave requires a medium to travel?

• Radio wave

• Light wave

• Microwave

• Sound wave

• Gamma ray