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20 questions
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- Q1What is the definition of resistance?The difference in electrical potential energy between two points.The rate at which energy is transferred in a circuit.The amount of charge flowing per second.The opposition to the flow of electric current.30sSC9.E.1
- Q2What is the unit of measurement for resistance?Coulomb (C)Ampere (A)Ohm (Ω)Volt (V)30s
- Q3How is resistance related to the energy required to drive a current through a component?Resistance is not related to energy transfer.Higher resistance requires less energy.Lower resistance results in more energy transfer.Higher resistance requires more energy.30s
- Q4What is the formula for calculating resistance?Resistance = Charge / TimeResistance = Energy / ChargeResistance = Current x Potential DifferenceResistance = Potential Difference / Current30s
- Q5If a component has a potential difference of 5 volts and a current of 0.2 amperes, what is its resistance?1 ohm10 ohms2 ohms25 ohms30s
- Q6What happens to the total resistance when resistors are connected in series?The total resistance decreases.The total resistance remains the same.The total resistance increases.The total resistance becomes zero.30s
- Q7If a 100-ohm resistor and a 50-ohm resistor are connected in series, what is their total resistance?50 ohms200 ohms5000 ohms150 ohms30s
- Q8Why does the total resistance increase when resistors are connected in series?The potential difference is divided among the resistors.The current has multiple pathways to flow through.The electrons collide more frequently with the atoms in the resistors.The current must pass through each resistor in turn.30s
- Q9What is the equivalent resistance of a circuit?The average resistance of all resistors in the circuit.The resistance of the smallest resistor in the circuit.The total resistance of all resistors in the circuit, combined into a single value.The resistance of the largest resistor in the circuit.30s
- Q10What is the relationship between the total resistance of resistors in parallel and the smallest individual resistor?The total resistance is double the smallest resistor.The total resistance is equal to the smallest resistor.The total resistance is less than the smallest resistor.The total resistance is greater than the smallest resistor.30s
- Q11Why does the total resistance decrease when resistors are connected in parallel?The potential difference is shared between the resistors.The current has multiple pathways to flow through.The current only flows through one resistor at a time.The electrons move slower in parallel circuits.30s
- Q12If two 100-ohm resistors are connected in parallel, will the total resistance be greater than, less than, or equal to 100 ohms?None of these.Equal to 100 ohms.Less than 100 ohms.Greater than 100 ohms.30s
- Q13How does resistance affect the brightness of a lamp in a circuit?All lamps in a circuit have the same brightness regardless of resistance.A lamp with higher resistance will be dimmer.A lamp with lower resistance will be dimmer.Resistance does not affect the brightness of a lamp.30s
- Q14If the current in a circuit is 0.5 A and the resistance is 20 ohms, what is the potential difference?0.25 V5 V10 V1 V30s
- Q15What happens to the energy carried by electrons as they pass through a component with resistance?The energy is transferred to other forms, such as heat and light.The energy is stored in the component.The energy remains the same.The energy is lost completely.30s