7) Which is mineral insulator

8) What is the total resistance if three resistances of 3 ohms, 9 ohms and 5 ohms are connected in series?

9) What is the total resistance if two resistances of 4 ohms and 6 ohms are connected in parallel?

10) Which is same in series connection of resistors in a circuit?

11) Which law states that at constant termperature the current passing through a closed circuit is directly proportional to the potential difference and inversely proportional to the resistance?