Science help!!!!!!!!!!1

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= ______________ A

I have this question for my homework its for physics a level but its a gcse question.... Could someone please help me ?Thank you its due tomorrow :frown:

This is a very simple question, read up on Ohms law

Reply 2

justagirltbh

OP

17

Original post by mnot

This is a very simple question, read up on Ohms law

i have ive got the equation and everything i just need help figuring the whole thing out

Reply 3

Pyruvic Acid

17

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?
Also, please try not to create dup threads.

Reply 4

Original post by Ruqaiyahhhh_

i have ive got the equation and everything i just need help figuring the whole thing out

You have the power & the voltage & you need to find the current, im sure if you go through your notes you'll find the relevant equation.

Reply 5

justagirltbh

OP

17

Original post by mnot

You have the power & the voltage & you need to find the current, im sure if you go through your notes you'll find the relevant equation.

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

i just dont know the rest

Reply 6

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

i just dont know the rest

You dont need to use time or coulombs your not calculating the energy.

Focus specifically on the 3 things:
-power
-voltage
-current

Reply 7

RogerOxon

21

Original post by justagirltbh

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= ______________ A

I have this question for my homework its for physics a level but its a gcse question.... Could someone please help me ?Thank you its due tomorrow :frown:

Voltage is Joules per Coulomb.
Current is Coulombs per second.
Power is Joules per second.

Reply 8

maniiiiii

4

Original post by hollie_cart16

If it’s so simple work it out and help them?? Don’t be arsey about it

It's not "aresy", the person that posted this defo aint an A level student. The person was just getting them to figure it out for themselves, because if you're studying A level Physics and can't answer this, that's a bit worrying no? How you going to learn if you don't do it yourself?

Reply 9

Original post by hollie_cart16

If it’s so simple work it out and help them?? Don’t be arsey about it

I wasnt being arsey. I was trying to get them to figure it out for themselves.

The formula for this would likely be on page 1 or 2 of their resources for this topic. It's important people understand the foundation so as they build up it all makes sense.

Reply 10

People need help sometimes, but you can't just give them the answers cos they won't learn. Tips will help a lot and so will hints.

Reply 11

hollie_cart16

2

Original post by maniiiiii

It's not "aresy", the person that posted this defo aint an A level student. The person was just getting them to figure it out for themselves, because if you're studying A level Physics and can't answer this, that's a bit worrying no? How you going to learn if you don't do it yourself?

People struggle at different things and sometimes need a little bit of guidance. All they were asking for was help. And if you know how to do it you may as well help them??

Reply 12

Original post by hollie_cart16

People struggle at different things and sometimes need a little bit of guidance. All they were asking for was help. And if you know how to do it you may as well help them??

Their is not whole lot of hints you can give to such a question, anything tangible would give them the formula to the final answer. It's also a topic this student needs to read up on if they are studying A-level physics, you need to consider the context.

Reply 13

hollie_cart16

2

Original post by mnot

I wasnt being arsey. I was trying to get them to figure it out for themselves.

The formula for this would likely be on page 1 or 2 of their resources for this topic. It's important people understand the foundation so as they build up it all makes sense.

If the formula was on a page for their resources topic don’t you think they would’ve done it on their own? They asked for help. Instead of saying it’s simple and tell them it’s ohms law. Guide them or tell them how it’s done.

Reply 14

Because just giving them the answer loses the meaning of a question. It tests your knowledge, not someone else's

Reply 15

giving the answer is only done when they have struggled for a long time

Reply 16

hollie_cart16

2

Original post by guanj-y19

Because just giving them the answer loses the meaning of a question. It tests your knowledge, not someone else's

If you’re not going to help someone then don’t bother commenting. It would save your time and their time

Reply 17

We are helping in little bits, not just shoving it into their hands.

Reply 18

maniiiiii

4

Original post by hollie_cart16

People struggle at different things and sometimes need a little bit of guidance. All they were asking for was help. And if you know how to do it you may as well help them??

LOOL fr a little bit of guidance, not the answer. I get that it would be easy to do so but long term it aint helping them and more time just delaying the problem that will pop up again in the future. Getting them to figure it out themselves will mean they're more likely to remember the method of how to do it.

Reply 19