What happens to the current in a parallel circuit when more branches with resistors are added? Explain why.
The current increases because adding more branches decreases total resistance, allowing more current to flow.
What is the unit of resistance?
Ohm (Ω)
According to Ohm's Law, V=IR. What does this formula describe?
The relationship between current, voltage, and resistance. Ohm’s Law relates voltage, current, and resistance.
Calculate the total resistance in a series circuit with three resistors of 2Ω, 4Ω, and 6Ω.
R total =2Ω+4Ω+6Ω=12Ω. Total resistance in series is the sum of all resistors.
What is the unit of electric current?
Ampere (A)
True or False: Ohm’s Law applies only to non-ohmic conductors.
Answer: False. Ohm’s Law applies to ohmic conductors, where voltage and current have a linear relationship.
What happens to the total resistance when resistors are connected in series?
It increases. In series, resistances add up, increasing total resistance.
In a series circuit, what happens to the current across each component?
c) It remains the same
Describe what would happen to the brightness of two bulbs if they are connected in series versus parallel.
The bulbs will be dimmer because they share the voltage. Parallel: The bulbs will be brighter because each gets the full voltage from the power source.
True or False: Adding resistors in parallel increases the total resistance of a circuit.
Answer: False. Adding resistors in parallel decreases total resistance.
Which of the following is true about voltage in a parallel circuit?
It remains the same across all components. In parallel circuits, voltage is the same across each branch.
True or False: Voltage is the electrical energy used to push charges through a circuit.
Answer: True. Voltage, also called potential difference, is the force that pushes charges.
Explain the difference between voltage in a series circuit and a parallel circuit.
In a series circuit, voltage is divided between components. In a parallel circuit, the voltage across each branch is the same as the source voltage.
Write the formula for power in terms of voltage and current. Explain what it means.
The formula is 𝑃 = 𝐼 𝑉 P=IV, which means power is the product of current and voltage, measured in watts.
What is resistance?
The opposition to the flow of electric charge. Resistance opposes the flow of electric current.
True or False: In a series circuit, the current is the same through all components.
Answer: True. Current is the same through all components in a series circuit.
In a circuit with two 1.5V batteries connected in series, what is the total voltage?
3V. In series, battery voltages add up, so two 1.5V batteries give 3V total.
What is electric current?
The flow of electric charge through a conductor
What happens to the total resistance when resistors are connected in parallel?
It decreases. In parallel, total resistance decreases as more paths are available for current to flow.
True or False: Cells (batteries) connected in series add their voltages together.
Answer: True. In series, the voltages of cells add together.
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