1.
State what is meant by current. [1]
JD SCIENCE
P3 Electricity and magnetism
Answer all questions. Show working. Answers are in a separate file on the Worksheets page — do not look at them until you have finished.
2.
State what is meant by potential difference. [1]
3.
State what is meant by resistance. [1]
4.
State what is meant by Ohm's law. [1]
5.
State what is meant by a series circuit. [1]
6.
State what is meant by a parallel circuit. [1]
7.
State what is meant by electrical power. [1]
8.
State what is meant by mains electricity. [1]
9.
State what is meant by the national grid. [1]
10.
State what is meant by static electricity. [1]
11.
Grace is asked about current in a OCR Physics paper.
(a) Describe current. [2]
(b) Explain why current is important in this topic. [3]
12.
Grace is asked about potential difference in a OCR Physics paper.
(a) Describe potential difference. [2]
(b) Explain why potential difference is important in this topic. [3]
13.
Grace is asked about resistance in a OCR Physics paper.
(a) Describe resistance. [2]
(b) Explain why resistance is important in this topic. [3]
14.
Grace is asked about Ohm's law in a OCR Physics paper.
(a) Describe Ohm's law. [2]
(b) Explain why Ohm's law is important in this topic. [3]
15.
Grace is asked about a series circuit in a OCR Physics paper.
(a) Describe a series circuit. [2]
(b) Explain why a series circuit is important in this topic. [3]
16.
Grace is asked about a parallel circuit in a OCR Physics paper.
(a) Describe a parallel circuit. [2]
(b) Explain why a parallel circuit is important in this topic. [3]
17.
Q = It. 2 A for 30 s [3]
18.
R = V/I. 12 V, 0.25 A [3]
19.
P = VI. 230 V, 2 A [3]
20.
E = Pt. 2 kW for 0.5 h in kWh [3]
21.
Two 4 Ω resistors in series [3]
22.
Two 4 Ω resistors in parallel [3]
23.
Grace carries out a OCR-style required practical linked to electricity. This is a typical OCR required-practical style question.
(a) Identify the independent variable and the dependent variable. [2]
(b) State one control variable and explain why it must be controlled. [2]
(c) Suggest one improvement or source of error and how it affects the result. [2]
24.
Grace carries out collecting valid data for electricity. This is a typical OCR required-practical style question.
(a) Identify the independent variable and the dependent variable. [2]
(b) State one control variable and explain why it must be controlled. [2]
(c) Suggest one improvement or source of error and how it affects the result. [2]
25.
Grace carries out drawing a graph for electricity. This is a typical OCR required-practical style question.
(a) Identify the independent variable and the dependent variable. [2]
(b) State one control variable and explain why it must be controlled. [2]
(c) Suggest one improvement or source of error and how it affects the result. [2]
26.
Grace carries out evaluating a method about electricity. This is a typical OCR required-practical style question.
(a) Identify the independent variable and the dependent variable. [2]
(b) State one control variable and explain why it must be controlled. [2]
(c) Suggest one improvement or source of error and how it affects the result. [2]
27.
Compare current with potential difference. [4]
28.
Compare potential difference with resistance. [4]
29.
Compare resistance with Ohm's law. [4]
30.
Compare Ohm's law with a series circuit. [4]
31.
Apply your knowledge of electrical power to this situation: energy per second [3]
32.
Apply your knowledge of mains electricity to this situation: live, neutral, earth [3]