IGCSE Physics - Electrical Circuits All Answers Correct

IGCSE Physics - Electrical Circuits All Answers Correct 1. Power is measured in... - Watts (W) 2. Electromotive force (emf)... - The force that causes the motion of electrons due to a potential difference. 3. Resistance... - Opposes the flow of current; high resistance means low current if voltage remains constant. 4. Current in metals... - In metals, current is the flow of negatively charged electrons. 5. Current is measured in... - Amperes (A) using an ammeter. 6. Ammeter... - Symbolically represented as 'A', it is placed in series in a circuit. 7. Charge is measured in... - Coulombs (C). 8. Voltage is measured in... - Volts (V) using a voltmeter. 9. Series circuits... - Have components connected one after another on the same loop of the circuit. 10. Parallel circuits... - Have components with multiple paths for the charge to flow. 11. Advantages and disadvantages of resistance... - Advantages: Used for electrical heating. - Disadvantages: Energy is wasted as heat. 12. Equation for Power, Current, and Voltage... - Power (P) is calculated using the formula: P = I * V (where I is current and V is voltage). Equation for Energy transferred, Current, Voltage and Time ️Energy transferred (j)= Current (a) * Voltage (v) * Time (s) (E=IVt) Equation for Charge, Current and Time ️Charge (Q)= Current (a) * Time (s) (Q=IT) Equation for Voltage, Current and Resistance ️Voltage (v)= Current (a) * Resistance (ohms) (V=IR) Circuit Symbol: Switch (open) ️ Circuit Symbol: Switch (closed) ️ Circuit Symbol: Cell ️ Circuit Symbol: Battery ️ Circuit Symbol: Resistor ️