unit 4 circuits review

What does Kirchhoff’s rules primarily explain in physics?

• The behavior of circuits based on conservation of charge and energy

• The principles of gravitational forces

• The laws of thermodynamics

• The structure of atomic particles

Which of the following is NOT a source of energy required to create current?

• Batteries

• Generators

• Capacitors

• Solar cells

What is the role of resistance in an electrical circuit?

• It enhances the flow of current

• It restricts the flow of current

• It measures the amount of current

• It generates electrical power

How does the voltage across series resistors compare to the voltage across parallel resistors?

• Voltage is the same across series resistors and adds up in parallel resistors

• Voltage adds up across series resistors and is the same across parallel resistors

• Voltage decreases across both series and parallel resistors

• Voltage is unpredictable in both series and parallel resistors

What determines the brightness of a lightbulb in a circuit?

• The color of the lightbulb

• The size of the lightbulb

• The power dissipated by the bulb

• The length of the circuit

What is the unit of measurement for electric current?

• Volts

• Ohms

• Amperes

• Joules

According to Ohm's law, which formula represents the relationship between voltage (ΔV), current (I), and resistance (R)?

• ΔV = IR

• ΔV = I/R

• ΔV = R/I

• ΔV = I+R

What type of resistors have a constant resistance regardless of the current through them or voltage across them?

• Nonohmic

• Variable

• Ohmic

• Dynamic

When resistors are connected in series, how is the total resistance calculated?

• It is the sum of the inverses of the individual resistances

• It is the inverse of the sum of the individual resistances

• It equals the current through any resistor in series

• It is the sum of the individual resistances

What effect does internal resistance in real batteries have on the circuit?

• Increases the voltage supply

• Decreases the voltage supply

• Has no effect on the voltage supply

• Multiplies the voltage supply