Battery and Resistor are in a cBattery and Resistor are in a closed loop. The ammeter reading is 10 mA, and the voltmeter reading is 0 V. (a) The voltmeter is defective. (b) The ammeter is faulty. (c) The voltage source is turned off or faulty.losed loop. The ammeter reading is zero, and the voltmeter reading is 10 V.