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A $500\, W$ heating unit is designed to operate from a $115\, volt$ line. If the line voltage drops to $110\, volt$, the percentage drop in heat output will be ............... $\%$
A resistor ${R_1}$ dissipates the power $P$ when connected to a certain generator. If the resistor ${R_2}$ is put in series with ${R_1}$, the power dissipated by ${R_1}$
If you are provided a set of resistances $2\, \Omega, 4\, \Omega$ $6\, \Omega$ and $8\, \Omega$. Connect these resistances so as to obtain an equivalent resistance of $\frac{46}{3}\, \Omega$.
Two resistances of $400\,\Omega $ and $800\,\Omega $ are connected in series with a $6\,volt $ battery of negligible internal resistance. A voltmeter of resistance $10,000\,\Omega $ is used to measure the potential difference across $400\,\Omega $ . The error in the measurement of potential difference (in volt) approximately is
Electric bulb $50\, W$ - $100\, V$ glowing at full power are to be used in parallel with battery $120\, V$, $10 \,\Omega$. Maximum number of bulbs that can be connected so that they glow in full power is