Y10 physics flashcard

Front

What is potential difference?

Back

The difference in electric potential between two points, measured in volts (V). It causes current to flow in a circuit.

Front

What is the effect of gamma rays on bacteria?

Back

Gamma rays cause mutations in the DNA of bacteria, which can lead to their death.

Front

Calculate the charge flow through a heater that transfers 4200 J of energy at a mains supply of 230 V.

Back

18.3 C (Coulombs) - Charge (Q) can be calculated using the formula Q = Energy (E) / Potential Difference (V).

Front

How long was the heating switched on between 07:00 and 09:00 if it was on for 60 minutes?

Back

60 minutes (1 hour) - This indicates the duration of heating.

Front

What happens to the laptop's operating time when a heater is connected?

Back

It would decrease the time - The heater draws power from the laptop's battery, reducing its operating time.

Front

What is current in an electrical circuit?

Back

The flow of electric charge, measured in amperes (A). It represents how much charge passes a point in the circuit per second.

Front

Define resistance in an electrical context.

Back

Resistance is the opposition to the flow of current in a circuit, measured in ohms (Ω).

Front

What is the formula for calculating power in an electrical circuit?

Back

Power (P) = Voltage (V) x Current (I), measured in watts (W).

Front

What is the unit of energy in the context of electricity?

Back

The unit of energy is the joule (J). It represents the work done when a current of one ampere passes through a potential difference of one volt.

Front

Explain the term 'electric shock'.

Back

An electric shock occurs when a person comes into contact with an electrical energy source, causing current to flow through their body.