What means powerplay and extras in cricket?

Answer 1

power play allows only some no of fielders to stand outside the circle of 30 metres

Answer 2

POWER PLAY:
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A Powerplay is a rule introduced in 2006 concerning fielding restrictions in One-Day International (ODI) cricket. In the past, there was a 15-over period at the start of an innings when only two fielders were allowed outside the 30-yard circle.

In an effort to keep the game more exciting during the middle overs, this rule was amended to apply not only to the first 10 overs of every innings, but also in two blocks of five overs, Powerplays, which will be used at the discretion of the fielding captain.

The first block of 10 overs of an innings is known as Powerplay One. The fielding restrictions during this period are exactly the same as per the old ODI rules with only two players being allowed to stand outside the 30-yard circle and two fielders required to be placed in close catching position.

The first block of five overs chosen at the fielding captain's discretion is known as Powerplay Two. The fielding captain has to decide at which point he wishes to implement this rule. He can only implement it at the beginning of an over, provided he informs the umpire.] Again, only two fielders are allowed outside the 30-yard circle. However there is no mandatory number of close catchers under this power play.

The second block of five overs, with identical parameters to Powerplay Two, is known as Powerplay Three.
When the fielding side's captain informs the umpire that he wishes to enact a powerplay, the official will signal as such by moving his arm in a circular motion.

EXTRAS:
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In the sport of cricket, an extra is a run scored by a means other than a batsman hitting the ball. Extras are also sometimes called sundries. Extras are added to the batting team's score, but are not added to any individual batsman's score.

Other than runs scored off the bat from a no ball, a batsman is not given credit for extras and the extras are tallied separately on the scorecard. A game with many extras is often considered as untidy bowling, the opposite are considered tidy bowling

The followijng constitutde extras:

1) No Ball.
2) Wide.
3) Leg byes
4) Byes.
5) Penalty runs.

For more details about extras, please check the following link:

http://en.wikipedia.org/wiki/Extra_(cricket)

Answer 3

The term power play means only 2 or 3 fielders should stand outside the circle.Up to 20 overs is the power play and extras means bowling no balls,wides,leg byes,byes and pen(a type of an extra).Few days ago ICC implemented a new rule.That rule is a free hit.Free hit means if the bowler bowls a no ball then he should be bowled next ball as free hit.Batsmen can do anything in the free hit.He can`t be out by a LBW or bowled or caught or stumped he can be out only by a run out.