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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5
In a series circuit, what happens to the current across each component?
c) It remains the same
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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.
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5
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.
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5
What is resistance?
The opposition to the flow of electric charge. Resistance opposes the flow of electric current.
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5
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.
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What is the unit of resistance?
Ohm (Ω)
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What is the unit of electric current?
Ampere (A)
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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.
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15
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.
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15
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.
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15
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.
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5
What happens to the total resistance when resistors are connected in series?
It increases. In series, resistances add up, increasing total resistance.
