When a potential difference of 20 V is applied across a resistor, it draws a current of 3A. If 30 V is applied across the same resistor, what will be the current ?

When a potential difference is applied across the ends of a linear metallic conductor

A potential difference of 100 V is applied across an electric bulb marked 40 W. 200 V. The power consumed in the bulb is . …………….. .

A potential difference of 20kV is applied across an X-ray tube. Find the minimum wavelength of X-ray generated.

When an electric field is applied across a semiconductor

Draw the output waveform across the resistor.

The potential difference between the terminals of an electric heater is 60 V when it draws a current of 4 A from the source. What current will the heater draw, if the potential difference is increased to 120V ?

When a 12V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit. Find the value of the resistance of the resistor.

Two electric bulbs are connected one by one across potential difference V At that time power consumed in them are P_1 and P_2 respectively. Now, if potential difference V is applied across series combination of these bulbs, what will be total power consumed ?

A potentiometer having the potential gradient of 2 mV//cm is used to measure the difference of potential across a resistance of 10 ohm . If a length of 50 cm of the potentiometer wire is required to get null point, the current passing through the 10 ohm resistor is (in mA )

Keeping the resistance constant, the potential difference applied across the ends of a component is halved. How does the current change?