$CATEGORY: Science - Khan Academy/12.Electricity/12.Electricity--Resistance of a system of Resistors

//Multiple Choice

In a parallel circuit, the potential difference across each resistor is\: {
    =The same
    ~Different
    ~Zero
    ~Twice the current
}

The total resistance of resistors connected in parallel is\: {
    ~Greater than the largest resistance
    =Less than the smallest resistance
    ~Equal to the average of all resistances
    ~Equal to the sum of all resistances
}

If two resistors of 6 Ω and 3 Ω are connected in parallel, the equivalent resistance is\: {
    ~9 Ω
    =2 Ω
    ~1.5 Ω
    ~4.5 Ω
}

When resistors are connected in parallel, the current through each resistor\: {
    ~Is the same
    =Is inversely proportional to its resistance
    ~Depends on the potential difference
    ~Is zero
}

The formula for calculating the equivalent resistance (R) of two resistors R1 and R2 connected in parallel is\: {
    ~R\=R1+R2
    =R\=(R1×R2)/(R1+R2)
    ~R\=R1×R2
    ~R\=R1/R2
}

Which of the following statements is true for resistors connected in parallel? {
    ~The current through each resistor is the same
    =The voltage across each resistor is the same
    ~The power dissipated in each resistor is the same
    ~The total resistance is the sum of the individual resistances
}

In a parallel circuit, if one resistor is removed, the total resistance\: {
    =Increases
    ~Decreases
    ~Remains the same
    ~Becomes zero
}

//True or False

In a parallel combination of resistors, the equivalent resistance is always greater than the individual resistances. {F}

In a parallel circuit, the current through each resistor is the same. {F}

The voltage across each resistor in a parallel circuit is the same. {T}

In a parallel circuit, the total current is divided among the resistors. {T}

The total resistance of resistors connected in parallel is always less than the smallest individual resistance. {T}

The total resistance of resistors in parallel is equal to the sum of their reciprocals. {T}

In a parallel circuit, all resistors have different voltages across them. {F}

Removing one resistor from a parallel circuit will decrease the total resistance. {F}

In a parallel circuit, the resistor with the highest resistance will have the least current flowing through it. {T}



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