Electrical Concepts and Measurements

This video tutorial covers the May 2019 GCSE Combined Science Trilogy Physics Paper 1. It includes detailed explanations of questions related to circuit components, solar panel efficiency, Rutherford's gold foil experiment, radioactivity, electrical safety, circuit measurements, and gas laws. The tutorial provides step-by-step solutions, highlighting key concepts such as current, potential difference, resistance, and the effects of temperature on gas pressure and states of matter.

What is the component X in the circuit of the shoe with lights?

• Lamp

• LED

• Resistor

• LDR

How is current in a series circuit described?

• It is the same throughout

• It is different in each component

• It varies at different points

• It is zero

How can the designer check for repeatability of the results?

• Repeat the experiment using exactly the same method

• Change the number of cells

• Repeat the experiment using different types of shoe

• Repeat the experiment with a different resistor

What is the name given to the error when a measuring device does not start at zero?

• Systematic error

• Random error

• Zero error

• Calibration error

What is the most likely value for the mean potential difference of a 40 cm² solar cell?

• 7.5 volts

• 10 volts

• 12.5 volts

• 15 volts

What happens to alpha particles that pass close to the nucleus of a gold atom?

• They lose energy

• They are absorbed

• They pass straight through

• They are deflected or reflected

What type of radiation is emitted by protactinium if it can pass through paper but is detected only up to one meter away?

• Gamma

• Neutron

• Beta

• Alpha

What is the function of the earth wire inside a cable?

• Carry current from the supply to the toaster

• Stop the metal case of the toaster becoming live

• Complete the circuit in the toaster

• Melt if a fault occurs

What type of energy is stored in a stretched spring?

• Thermal energy

• Kinetic energy

• Elastic potential energy

• Chemical energy

What happens to the particles of a gas as it cools down and condenses into a liquid?

• They gain energy

• They become more spread out

• They move faster

• They lose energy and move slower