Q9 Circle the example in each pair that has more electrical resistance.
Conductor/Insulator Thin wire/ Thick wire Cooler wire/ Hot wire
Longer wire/ Short wire
Thick wire and hot wire
To determine which example in each pair has more electrical resistance, we need to understand the factors that affect resistance.
Resistance is defined as the opposition to the flow of electric current. It depends on three factors: the material of the wire, the length of the wire, and the cross-sectional area of the wire.
1. Conductor/Insulator: In this pair, the material of the wire is being compared. Conductor wires allow the flow of electric current, while insulator wires do not. Since conductor wires allow current to flow more easily, they have lower resistance compared to insulator wires. Therefore, the example of a conductor wire has less electrical resistance.
2. Thin wire/Thick wire: In this pair, the cross-sectional area of the wire is being compared. Thicker wires have a larger cross-sectional area, which means there is more space for the current to flow through. This reduces the opposition to the flow of current and results in lower resistance. So, the example of a thick wire has less electrical resistance compared to a thin wire.
3. Cooler wire/Hot wire: In this pair, the temperature of the wire is being compared. The resistance of most conductors increases as temperature increases. So, the example of a cooler wire has less electrical resistance compared to a hot wire.
4. Longer wire/Short wire: In this pair, the length of the wire is being compared. Resistance is directly proportional to the length of the wire. The longer the wire, the greater the resistance. Thus, the example of a longer wire has more electrical resistance compared to a short wire.
To summarize:
- Conductor has less resistance than an insulator.
- Thick wire has less resistance than a thin wire.
- Cooler wire has less resistance than a hot wire.
- Short wire has less resistance than a long wire.
To determine which example in each pair has more electrical resistance, we need to consider the factors that affect resistance.
1. Conductor/Insulator:
An insulator has more electrical resistance compared to a conductor. Therefore, the example with an insulator will have more resistance.
2. Thin wire/Thick wire:
A thin wire has more electrical resistance compared to a thick wire. Therefore, the example with a thin wire will have more resistance.
3. Cooler wire/Hot wire:
A cooler wire has less electrical resistance compared to a hot wire. Therefore, the example with a hot wire will have more resistance.
4. Longer wire/Short wire:
A longer wire has more electrical resistance compared to a short wire. Therefore, the example with a longer wire will have more resistance.
In summary, the examples with more electrical resistance are:
- Insulator
- Thin wire
- Hot wire
- Longer wire