4-Cell D-Size Battery Holder Capacity_10mL this four-socket E10 lamp holder

this four-socket E10 lamp holder pre-wires four bulbs across a single pair of 4mm banana terminals

sized to slot into modular Ohm's-law and series-parallel-circuit investigations

resistor networks

letting students measure rotational distance against linear advance to derive the mechanical advantage of the spiral

5-inch needle-pointed stand grips a 3/4-inch-wide bar magnet upright for hands-free study of attraction

4-Cell D-Size Battery Holder Capacity_10mL this four-socket E10 lamp holderFour cell D size holder in unbreakable plastic with curved retention sides, sized to deliver 6V at the high current capacity of D cells for sustained electromagnet and motor demonstrations.