Curriculum
Course: AS Physics 9702
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Curriculum

AS Physics 9702

1. Physical quantities and kinematics

0/41 Dr Dabour Hub Science Diagram and Course Material

2. Dynamics, forces and pressure

0/46 Dr Dabour Hub Science Diagram and Course Material

3. Work, energy, power and deformation

0/31 Dr Dabour Hub Science Diagram and Course Material

4. Waves and superposition

0/39 Dr Dabour Hub Science Diagram and Course Material

5. Electricity and D.C. circuits

0/49 Dr Dabour Hub Science Diagram and Course Material

7. Circular motion and gravitational fields (A Level)

0/25 Dr Dabour Hub Science Diagram and Course Material

8. Thermal physics (A Level)

0/37 Dr Dabour Hub Science Diagram and Course Material

10. Electric fields and capacitance (A Level)

0/36 Dr Dabour Hub Science Diagram and Course Material

11. Magnetic fields and alternating currents (A Level)

0/46 Dr Dabour Hub Science Diagram and Course Material

12. Quantum and nuclear physics (A Level)

0/44 Dr Dabour Hub Science Diagram and Course Material

13. Medical physics and astronomy (A Level)

0/42 Dr Dabour Hub Science Diagram and Course Material
Quiz

19.3.2 Capacitor Discharge Equations – Check yourself

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1.
The time constant of a discharge circuit is
R/C
C/R
RC
R + C
2.
After a time equal to RC, the charge has fallen to about
50%
37%
14%
5%
3.
R = 50 kΩ and C = 20 μF. The time constant is
1.0 s
2.5 s
0.40 s
1000 s
4.
The initial p.d. is 12 V and RC = 2.0 s. The p.d. after 4.0 s is closest to
1.6 V
4.4 V
6.0 V
0.0 V
5.
A graph of ln I against t has gradient −5.0 s⁻¹. The time constant is
5.0 s
1.4 s
0.69 s
0.20 s
6.
The half-life of a discharge with RC = 3.0 s is
4.3 s
3.0 s
2.1 s
1.5 s
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