GCSE Physics by Cognito - Energy conservation & systems

Choose the correct option(s): True or False? Buying a new powerful charger will help your phone create more energy for itself.

• True, a more powerful charge will create more new energy in the battery of the phone.

• False, the new powerful charger will just increase the rate of charging.

• True, a more powerful charger will create more energy in the battery than it spends.

• False, the new powerful charger doesn't create new energy - it just destroys less energy.

Choose all the correct option(s): Which of the energy transfer chains are correct for phone being charged?

• Electrical Energy of Mains Supply -> Light Energy of the Screen & Mechanical Energy of the Speaker

• Chemical Energy of the Battery -> Electrical Energy of the microchips -> Thermal Energy of the Battery

• Electrical Energy of the Mains Supply -> Chemical Energy of the battery -> Electrical Energy of the components

• Mechanical Energy of the phone -> Thermal Energy of the battery -> Light Energy of the screen

• Thermal Energy of the battery -> Electrical Energy of the components -> Chemical Energy of the battery

Choose all the correct option(s): Which of the options give dissipated energy examples in a phone?

• thermal energy of the battery

• light energy of the screen

• sound energy of the speaker

• radiation energy of the always working antenna in a phone

• chemical energy of the battery

Choose the correct option(s): What is (are) the main condition for a system to be 'closed'?

• No exchange of matter with surroundings.
• No change in temperature over time.
• Exchange of energy with surroundings.
• Constant pressure throughout the process.
• Absence of external (resultant) forces in the system.