info@qrpastpapers.com +20 106 606 6272

qr past papers logo brand

  • Home
  • Products
  • Free Past Papers
  • more
    • Plans
    • About
    • Our Team
    • Contact Us
    • How It Works
    • Our Services
    • Why Us?
    • Login
    • Sign Up
    • Cart and payment

Edexcel | Physics 4PH0 | W 17 1 | Q9

W 17 1
9
Add To Classified

The diagram shows a hydroelectric power station.

Water flows down the tunnel and turns a large turbine.

W 17 1
9
(a)
Add To Classified
1 Mark

What type of energy decreases when the water flows from the upper lake to the turbine?

 

   

gravitational potential (energy); 

 

 

GPE 

 

 

W 17 1
9
(b)
Add To Classified
3 Mark s

Describe how the turbine and generator produce electricity.

 

   

any three of: 

MP1. turbine spins;

MP2. (causes) coils of wire spin;

 

MP3. between the poles of (large)

magnets;

MP4. current or voltage is inducedMP5. in or across the coils of wire; 

 

allow 

turbines rotates

magnets spin

 

inside coils of wire 

 

 

W 17 1
9
(c)
Add To Classified
1 Mark

 Suggest why it is important that the turbine turns at constant speed.

   

any one of:

MP1. to keep voltage or current (value)

constant;

MP2. voltage (or current) produced

depends on the speed of rotation (of

coil);

 

 

allow 

frequency of voltage

depends on the speedof rotation

 

 

 

W 17 1
9
(d)
Add To Classified

This is a Sankey diagram for the power station.

 

W 17 1
9
(d) (I)
Add To Classified
1 Mark

State the relationship between efficiency, useful energy output and total energy input.

 

W 17 1
9
(d) (II)
Add To Classified
4 Mark s

 The efficiency of the power station is 36%.

   The total energy input is 1050 kJ.

   Calculate the total wasted energy in kJ.

 

total wasted energy = ............................................. kJ

   

 

substitution;

rearrangement;

evaluation of useful energy;

subtraction from input energy;

e.g.

wasted energy = 1050-378 = 672 (kJ)

                                                 gains 4 

 

allow alternative

method by calc 64% of

1050 kJ

 

 

POT error (often as 36

not seen as % or

fraction) loses 1st mark 

 

 

W 17 1
9
(d) (III)
Add To Classified
2 Mark s

Name two forms of wasted energy in this power station.

 

   

 

any two suitable energy forms:

e.g.

thermal energy (of the water);

frictional heating (along the pipe/in

bearings);

noise/sound; 

 

 

 

 

condone ‘heat’

not just ‘friction’ 

 

 

QR Past Papers.

Email:info@qrpastpapers.com
Phone: +2 0106 606 6272

  • Home
  • Legal Information
  • Terms And Conditions
  • Return & Refund Policy
  • Privacy policy
  • Login
  • Register
  • Shop
  • About us
  • Contact US
  • Services

Our Social Networks

Follow us

© Copyright 2021, QR PAST PAPERS. All Rights Reserved.
All the included past papers are copyrighted © University of Cambridge Local Examinations Syndicate (UCLES), which we have collected from various online sources and gathered together in one website.