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Exam (elaborations)

oefentoets natuurkunde elektriciteit 2 vwo met antwoorden

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oefentoets natuurkunde elektriciteit 2 vwo met antwoorden

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Nask 2V PW elektriciteit: oefentoets uitwerking
Onweerswolk
2p 1 Leg uit dat de grond onder de wolk hierdoor positief geladen wordt.
 De elektronen in de grond bewegen van de wolk weg omdat ze door de negatieve
lading in de wolk worden afgestoten.
 Er ontstaat dus een elektronentekort in de grond.


Weerstanden in serie
2p 2 Bereken de vervangingweerstand Rv.
 Rv = 32 + 56 = 88 Ω 2

3p 3 Bereken de spanning over R1.
 Itot = U/Rv = 4, = 0,050 A 1
 U1 = R1  Itot = 32  0,050 = 1,6 V
1


Radio
2p 4 Hoe groot is de stroomsterkte die door de batterij wordt geleverd als deze
radio aan staat?
 gebruik 1


 1

3p 5 Hoe lang kan de radio bij het geleverde vermogen van 0,15 W op deze
hoeveelheid energie spelen?
 1
 gebruik 1

 1

Looplamp
1p 6 Wat is de functie van de weerstand in deze schakeling?
 de weerstand zorgt ervoor dat van de 12 volt uit de spanningsbron er
maar 9 volt over de looplamp komt 1

3p 7 Bereken de grootte van de gebruikte weerstand met de gegevens in het schema
van de looplamp.
 de spanning over de weerstand is 1
 de stroomsterkte door de weerstand is 0,3 A 1
 1




1

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