6. A safety device consisting of a strip of wire that melts and breaks an electric circuit if the current exceeds a safe level, used to prevent electrical fires a. battery b. fuse c. ground d. relay 7. It gives the circuit a source of energy a. battery b. fuse c. relay d. switch 8. It controls one electrical circuit by opening and closing contacts in another circuit a. battery b.ground c. relay d. resistor 9. An instrument used for measuring electric current in units of amperes a. ammeter b. battery c. relay d. switch 10. It controls the flow of current to other components a. ammeter b. battery c. fuse d. resistor​