Two conductors, one having resistance $R$ and another $2 R$ are connected in turn across a $dc$ source. If the rate of heat produced in the two conductors is $Q_{1}$ and $Q_{2}$ respectively, what is the value of $Q_{1} / Q_{2}$ ?
Two conductors, one having resistance $R$ and another $2 R$ are connected in turn across a $dc$ source. If the rate of heat produced in the two conductors is $Q_{1}$ and $Q_{2}$ respectively, what is the value of $Q_{1} / Q_{2}$ ?
We know that $\frac{ V ^{2}}{ R } t,$ therefore, $\frac{ Q _{1}}{ Q _{2}}=\frac{ R _{2}}{ R _{1}}=\frac{2 R }{ R }=2$
Similar Questions
$(a)$ What is an electric circuit ?
$(b)$ Calculate the number of electron that flow per second to constitute a current of one ampere. Charge on an electron is $1.6 \times 10^{-19} C$.
$(c)$ Draw an electric circuit for studying Ohm's law. Label the circuit component used to measure electric current and potential difference.
$(a)$ What is an electric circuit ?
$(b)$ Calculate the number of electron that flow per second to constitute a current of one ampere. Charge on an electron is $1.6 \times 10^{-19} C$.
$(c)$ Draw an electric circuit for studying Ohm's law. Label the circuit component used to measure electric current and potential difference.
Find out the following in the electric circuit given in Figure.
$(a)$ Effective resistance of two $8\,\Omega $ resistors in the combination
$(b) $ Current flowing through $4\,\Omega $ resistor
$(c)$ Potential difference across $4\,\Omega $ resistance
$(d)$ Power dissipated in $4\,\Omega $ resistor
$(e)$ Difference in ammeter readings, if any.
Find out the following in the electric circuit given in Figure.
$(a)$ Effective resistance of two $8\,\Omega $ resistors in the combination
$(b) $ Current flowing through $4\,\Omega $ resistor
$(c)$ Potential difference across $4\,\Omega $ resistance
$(d)$ Power dissipated in $4\,\Omega $ resistor
$(e)$ Difference in ammeter readings, if any.
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Which of the following has the unit volt?
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A current of $1$ ampere flows in a series circuit containing an electric lamp and a conductor of $5\,\Omega $ when connected to a $10\, V$ battery. Calculate the resistance of the electric lamp.
Now if a resistance of $10\,\Omega $ is connected in parallel with this series combination, what change (if any) in current flowing through $5\,\Omega $ conductor and potential difference across the lamp will take place? Give reason.
A current of $1$ ampere flows in a series circuit containing an electric lamp and a conductor of $5\,\Omega $ when connected to a $10\, V$ battery. Calculate the resistance of the electric lamp.
Now if a resistance of $10\,\Omega $ is connected in parallel with this series combination, what change (if any) in current flowing through $5\,\Omega $ conductor and potential difference across the lamp will take place? Give reason.