generated by a solar cell increases. A of 1/V2 against d will give a straight line. Decrease the value of resistor, R, or decrease the value of capacitor, C. Capacitors (p30) LEDs (p31) A capacitor stores A is an electrical Thermistors & LDRs (p32 33) – energy / charge. component that only allows current to flow in As temperature (a) 0 V one direction through it. increases, resistance 6 V decreases. 0V Electrical Light As temperature Advantages: Less increases, current current, Less heat given increases. off. Disadvantage: Not as Any value greater bright. than 5700 Ω. (a) The resistor Increase the value of protects the LED from resistor, R, or increase being damaged by a high the value of the current. capacitor, C. 2800 Ω (a) B only.
generated by a solar cell increases. A of 1/V2 against d will give a straight line. Capacitors (p30) A capacitor stores energy / charge. (a) 0 V 6 V 0V Increase the value of resistor, R, or increase the value of the capacitor, C. (a) Decrease the value of resistor, R, or decrease the value of capacitor, C. LEDs (p31) A is an electrical component that only allows current to flow in one direction through it. Electrical Light Advantages: Less current, Less heat given off. Disadvantage: Not as bright. (a) The resistor protects the LED from being damaged by a high current. 2800 Ω B only. Thermistors & LDRs (p32 – 33) As temperature increases, resistance decreases. As temperature increases, current increases. Any value greater than 5700 Ω.
Electricity-and-Energy-Problem-Booklet-St-Lukes.docx