Answer:
1.5v
Step-by-step explanation:
To find the electric potential difference across lamp 1, you will need to know the resistances of the lamps and the current flowing through the circuit. The electric potential difference across each lamp is equal to the current flowing through the lamp multiplied by the resistance of the lamp.
You can use Ohm's law to calculate the current flowing through the circuit. Ohm's law states that the current flowing through a conductor is equal to the electric potential difference across the conductor divided by the resistance of the conductor.
Once you have calculated the current, you can use the electric potential difference equation (voltage = current * resistance) to find the electric potential difference across each lamp.
Alternatively, you can use Kirchhoff's voltage law to solve for the electric potential difference across each lamp. Kirchhoff's voltage law states that the sum of the electric potential differences across all of the elements in a circuit is equal to the electric potential difference of the source. So, if the electric potential difference across lamps 2 and 3 is 4.8 V each, and the electric potential difference of the source is 10.9 V, then the electric potential difference across lamp 1 must be 1.5 V.