Electrical Engineering All Engineering Career

When two lamps of different wattages are connected in series across a voltage source, the lamp with lower wattage will glow brighter because it has higher resistance and therefore drops more voltage across it. 

So, in this case, the 40 W lamp will glow brighter. 

Additionally, since lamps in series share the same current, there is a risk of the 40 W lamp fusing due to the higher current passing through it compared to its rating. However, whether it will actually fuse depends on the specific characteristics of the lamps and the circuit protection.

The component most effective in reducing the magnitude of the current in a circuit, regardless of whether it's AC or DC, is a resistor.

The minimum charge on an ion is equal to the charge of an electron.

A field of force can exist only between two charged particles, such as two ions.

A substance whose molecules consist of dissimilar atoms is called a compound.

An electric filament bulb can be operated from both AC and DC supplies. Therefore, the correct option is All above.

When an open resistor is checked with an ohmmeter, it reads infinite resistance.

When the resistance element of a heater fuses and then we reconnect it after removing a portion of it, the power of the heater will increase. 

This is because by removing a portion of the resistance element, we effectively decrease its resistance. According to Ohm's Law (P = V^2 / R), if resistance decreases, power increases, assuming the voltage remains constant.

Heat in a conductor is produced on the passage of electric current due to resistance.

Resistance of a material always decreases if the temperature of the material is decreased.