Which of the following statements are true regarding transformers? Check all that apply. Check all that apply. In a transformer, if the primary coil contains more loops than the secondary coil, then it is a step-up transformer. A transformer is used to increase or decrease an alternating current voltage. A transformer is used to increase or decrease a direct current voltage. A transformer converts mechanical energy into electrical energy. In a transformer, the power input is less than the power output. In a transformer, if the secondary coil contains more loops than the primary coil, then it is a step-up transformer