CPU Consumption on SQL Server

I have used the following query to get the 10 worst CPU consuming queries on the SQL Server. what fact can cause a high CPU consumption ? Will it be possible that the CPU are doing table scan ? Tks


SELECT TOP 10
    sql.text as sql
   , qp.query_plan
   , creation_time
   , last_execution_time
   , execution_count
   , (total_worker_time / execution_count) as avg_cpu
   , total_worker_time as total_cpu
   , last_worker_time as last_cpu
   , min_worker_time as min_cpu
   , max_worker_time as max_cpu
   , (total_physical_reads + total_logical_reads) as total_reads
   , (max_physical_reads + max_logical_reads) as max_reads
   , (total_physical_reads + total_logical_reads) / execution_count as avg_reads
   , max_elapsed_time as max_duration
   , total_elapsed_time as total_duration
   , ((total_elapsed_time / execution_count)) / 1000000 as avg_duration_sec
FROM sys.dm_exec_query_stats qs
CROSS APPLY sys.dm_exec_sql_text(sql_handle) sql
CROSS APPLY sys.dm_exec_query_plan (plan_handle) qp
ORDER BY qs. total_worker_time DESC