5. The ac system is preferred to de system because-
                
             
         
        
                                                                        
                            
                                
                            
                            
                                
                            
                            
                                
                            
                            ac voltages can be easilty changed in magnitude 
                         
                    
                    
                                                                                
                            
                                
                            
                            
                                
                            
                            
                                
                            
                            de motors do not have fine speed control
                         
                    
                    
                                                                                
                            
                                
                            
                            
                                
                            
                            
                                
                            
                             high voltage ac transmission is less efficient
                         
                    
                    
                                                                                
                            
                                
                            
                            
                                
                            
                            
                                
                            
                            de voltage cannot be used for domestic appliances
                         
                    
                    
                                                         
                    
                            
                    ব্যাখ্যা: Current can be categorized into two types- 
1. Alternating current (AC), in which flowing current changes its direction.
 2. Direct current (DC), in which the current flows in one directions.