# Hoework help

#### hotstuff

Electrons in a television set are accelerated through a potential difference of 2.0 kV.
(a) Find the speed of the electrons when they reach the screen. Ignore any relativistic effects.

how to do this i have no idea what formula to use

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#### OlderDan

Homework Helper
hotstuff said:
Electrons in a television set are accelerated through a potential difference of 2.0 kV.
(a) Find the speed of the electrons when they reach the screen. Ignore any relativistic effects.

how to do this i have no idea what formula to use
What is the definition of electric potential? The problem tells you how much the electron's electric potential will change. How much will its potential energy change? How much will its kinetic energy change? Assume the electron starts at test. How much velocity does it acquire?

#### geosonel

hotstuff said:
Electrons in a television set are accelerated through a potential difference of 2.0 kV.
(a) Find the speed of the electrons when they reach the screen. Ignore any relativistic effects.

how to do this i have no idea what formula to use
check here:
http://hyperphysics.phy-astr.gsu.edu/hbase/electric/ev.html#c2
see above URL page to find (for charge initially at rest):
(work done on charge q by potential difference ΔV) = (1/2)mv2 = qΔV

other concepts you may need later:
http://hyperphysics.phy-astr.gsu.edu/hbase/electric/elewor.html#c1

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