SUBJECT: PHYSICS

Complete solutions and avoid using chatgpt and handwritten answers

11. A semiconductor device has a resistance of 1200 ohms at room temperature (25C). Unlike metals, its resistance decreases with an increase in temperature due to an increase in charge carriers. If the resistance of the semiconductor decreases by 2% for every 1C increase in temperature, calculate its resistance at 35C. 12. A 9-volt battery with an internal resistance of 0.5 ohms is connected to a resistor of 4.5 ohms. Calculate the terminal voltage across the resistor and the total current flowing through the circuit. 13. A rechargeable battery pack used in electric vehicles has an EMF of 400 volts and an internal resistance of 0.1 ohm. During operation, it drives a motor that has a resistance of B0 ohms. Determine the terminal voltage of the batiery when it is driving this motor and the efficiency of the power delivery from the battery to the motor. 14. A 12-volt battery with an internal resistance of 1 chm is used in a circuit with two parallel branches. One branch has a resistor of 8 ohms, and the other has a resistor of 12 ohms. Calculate the current through each branch, the total current drawn from the battery, and the terminal voltage of the battery. 15. A solar panel system is designed to produce an EMF of 24 volts with an internal resistance of 0.2 ohms. If this system is connected to an external load of 5 ohms, calculate the terminal voltage at the load, the power dissipated by the load, and the power wasted as heat due to the internal resistance of the solar panel