2020 paper corrections Flashcards
what is meant by a zero error
displays a reading when not connected to a circuit
why does an appliance not work if the cells are the wrong way round if a diode present
no current in the diode in the reverse direction as a diode has a high resistance in the reverse direction
describe the process of nuclear fission
a neutron is absorbed by a uranium nucleus and it becomes unstable
the nucleus splits into two parts
2 or 3 neutrons are released
gamma rays are emitted
how does nuclear fusion lead to production of energy
lighter nuclei fuse to form heavier nuclei
some mass is converted to energy
what is the advantage of a shorter half life
less harmful to the body as the activity decreases quickly
why does adding resistors in parallel decrease the total resistance
it creates multiple paths for electrons to flow
so the total current is greater than
why did can an electrician receive an electric shock if the circuit wasn’t disconnected from mains
one of the wires in the switch is live
so the electrician is earthed
so there is. a larger potential difference between the live wire and electrician
