# help URGENT

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#1
the electric motor in the car is powered by a battery. To charge the battery, the car is plugged into the mains supply at 230v. The power used to charge the battery is 6.9KW. Calculate the current used to charge the battery.

current= ?????

I have this question for my homework its for physics a level but its a gcse question.... Could someone please help me ?
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1 month ago
#2
(Original post by Ruqaiyahhhh_)
the electric motor in the car is powered by a battery. To charge the battery, the car is plugged into the mains supply at 230v. The power used to charge the battery is 6.9KW. Calculate the current used to charge the battery.

current= ?????

I have this question for my homework its for physics a level but its a gcse question.... Could someone please help me ?
I don't see why that should be A level - it seems perfectly fine for GCSE. What values do you have? What equation links these values?
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#3
(Original post by KaziMahathir)
I don't see why that should be A level - it seems perfectly fine for GCSE. What values do you have? What equation links these values?
so theres 230 v
and the power used to charge the battery is 6.9kw

current in amps= charge in coulombs divided by time in seconds or i= q divided by t

do you know or can help me?
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1 month ago
#4
(Original post by Ruqaiyahhhh_)
so theres 230 v
and the power used to charge the battery is 6.9kw

current in amps= charge in coulombs divided by time in seconds or i= q divided by t

do you know or can help me?
We have P and V, and we're trying to find I.
What equation should we use?

There's no point in introducing Q or T if it's not in the question!
Last edited by KaziMahathir; 1 month ago
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1 month ago
#5
P=IV should work
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#6
(Original post by MinnieW09)
P=IV should work
so if i do power= i x v

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1 month ago
#7
(Original post by Ruqaiyahhhh_)
so if i do power= i x v

Just sub in the values you were given in the question
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1 month ago
#8
(Original post by Ruqaiyahhhh_)
so if i do power= i x v

What more help do you need? You have the equation and one unknown. Just plug the numbers in
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