8,9,10 please and thank you so much for your help

8 . A power supply provides 24.2 V to run a DC motor. When the motor is jammed so that the armature can't turn, the current drawn is 14.0 A. a) What is the resistance of the armature? a) 2 marks b) When fully operating, the back EMF generated is 19.8 V. Determine the current flowing through the armature as it rotates. b ) 3 marks 9. Explain why a transformer is unable to induce an EMF voltage and current in a secondary circuit if its primary coil is connected to a DC (direct current) power supply such as a battery. 2 marks 10. A transformer has 1800 turns on the primary coil and 270 turns on the secondary coil. If an AC power supply of 120 V is attached to the transformer, a current of 9.4 A is induced in the secondary coil and circuit. a) Determine the secondary voltage induced in the transformer. a) 2 marks b) Calculate the primary current supplied to the transformer. b) 2 marks c) Name this type of transformer. C) I mark